Sunshine Yoshi said:
For one thing, since playability > content, MK8 > MK8DX.
...what on earth does this mean? Playability? The gameplay itself is all essentially the same between both versions.
Sunshine Yoshi said:
And by extension, Wii U ports to Switch are generally inferior to the original versions.
i am aware that you have an enomorous hatred for the switch while idolising what came before it (3ds in particular, but also evidently the wii u) but please do not make such sweeping generalisations, especially when they're simply flat out wrong.
lets look at a list of what first-party games have been ported so far:
Zelda: Breath of the Wild - both versions were released at once, so they were specifially designed to be exactly the same
Mario Kart 8 (DX) - all content from the original game AND its dlc, as well as an all-new battle mode and extra characters
Pokken Tournament (DX) - everything from both the wii u AND arcade versions, plus a couple of extras thrown in like a new character
Bayonetta 2 - essentially the same package as on wii u
Hyrule Warriors (Definitive Edition) - everything from wii u + it's dlc AND 3ds + it's dlc, and a few extras on top of even that
DKC: TF - literally everything from the original version, plus a new mode and character
Captain Toad - everything from the original game (including touch controls, contrary to what you stated) minus the levels taken out of super mario 3d world
as you can see, when you put each version side by side, each switch version is
at least as good it's wii u predecessor, with the vast majority actually adding more to make it better. whether or not it's worthwhile to buy them again after owning a wii u or if there's enough new content to justify doubling dipping is up for debate, but to call them inferior is just silly
the only thing i haven't addressed up there is second-screen functionality. while it is true that the second screen was intended to be the main draw of the wii u, most of these games (and wii u games in general) don't actually use the feature that extensively. the most common usage of the second screen is just off-tv play which is literally just having what would be on the tv on a handheld screen. you know, that thing the switch does. the second most common use is for sub-menus/maps/etc, and while this isn't something that can be replicated on switch, it's also not something that breaks the games so much that they are permanently ruined. it just means you have to press the pause button before you can access those features.
of course, there are games that do utilise the second screen in actually meaningful ways, but none of those are in the list above (apart from arguably captain toad, but i'll get to that in a minute), they're all just submenus or some form of off-tv/screen mirroring. so while i will admit that the lack of second-screen is technically a removal and could be seen as inferior, in these cases the differences are so minor that complaining about it is just dumb.
as for your game specific points...
Sunshine Yoshi said:
Captain Toad is a prime example. Not only did it remove touch precision and second screen (because hardware limitations), but they removed all references to Mario 3D World, the foundation of the game. This is why I have no intention to get this on Switch.
hating on the captain toad port honestly seems a bit strange to me. like, it still has touch controls in handheld mode, and the alternative they came up with, while a bit fiddly, is still a perfectly good way to play the game (in fact, i've found this is even easier to use in tandem with moving than the original touch controls were). also you're again acting like removal of second screen is some huge sin, but both screens literally had the same display on them, and when you have levels with touch control stuff in them (or you just want to use it to stop enemies etc) it essentially means that you're forced to look at one screen anyway to use those, and its not even the hd screen. at least now on switch i can play it on the tv without worrying about that. sometimes a 'feature' being removed can actually serve to improve the overall experience
anyway, they 'removed all references to mario 3d world'? a bit of an exageration there, my friend. they removed 4 levels. 4 levels which were not initially designed to have captain toad playable in them, and were just copy pasted in from a separate game to add a little bonus. now theres some levels specifically designed for this game to replace them. could they have left them in? sure. but there wouldn't be much fun in that because the main fun of the levels is to say 'i remember this from smd3d' rather than interesting puzzles or gameplay, and on a console that doesn't have that game it just wouldn't make much sense to keep it.
Also, DKC Tropical Freeze has a New Funky Mode that (as cool as it looks) isn't worth buying the same game again for three times the price.
not a lot to say here except for the fact that, as i said before, stuff like whether it's worth buying again or the price or stuff like that doesn't have any bearing on the quality of the game itself. in this case, it has more content, better graphics and improved loading times on switch so it's objectively a better version of the game.
anyway this ended up being a long-winded post but if i were to give a tl;dr or conclusion or something i guess it would be something like this:
it's ok to not like having to buy a game again if you already own it on one console and it's ok to come to your own conclusions about whether its worth buying something again, but those opinions have no bearing on the actual quality of the games in question