Personally I really like all the cool new features, even if a couple SMF features went away as a result. The layout will take some getting used to, but I think over time I'll come to like it better than SMF.
Post ranks actually still exist, but are overwritten by custom titles should you have one. At least higher position ranks no longer replace post ranks, so I don't have to forfeit Shine Sprite to be part of the Poll Committee.I pretty much like everything more about it. More kinds of reactions to give posts, status updates for random thoughts that don't pertain to Mario and don't really need entire threads to ruminate about, being able to post images without having to rely on imgur (still wouldn't abuse it though), quicker to reply to things, much easier formatting (though BBCode is still useful to learn), more useful follow function, more useful "what's new" link, emoji options, file attachment options (don't think I need this to be fair), links to the wiki/discord and what's new always being at the top of the screen, and maybe more I missed. The few things we lost, such as gif avatars, getting smallish circle avatars, having those little icons I used for the top of each post I made, stars (the new color bars that denote user rights are very bright and garish), less convenient access to subforums, ranks (though yeah I don't miss having the Donkey Kong rank), display names (temporarily it seems) are fine, worth it for the newer software.
Mobile view still sucks though.