The reason there isn't this topic is that discussion of Nintendo Switch Online is already done in the Nintendo Switch thread. Since you have posted a topic about it, perhaps I should chime in on my thoughts on it.
I think that the biggest appeal of the Nintendo Switch Online has to be the online play, because the only significant feature to get with it is Cloud Saves (although quite a few games don't support it). If this service worked like PS3 and Vita in which online play is not one of the features of the paid service, I am sure it would be far less popular since quite a number of games are best enjoyed online, especially Splatoon 2, and online play is the prime reason for this service. In this case, it's quite crafty but admittedly strategic that they set up the service under those circumstances. Still though, I felt that it's best to start up the service like what Sony did for PS3/Vita and then prop up the service to be robust, so that it has better features other than cloud saves and it would make for a better offer.
I am glad that Nintendo has a few offerings that made the service worth it, namely Tetris 99 and the NES/SNES Online offerings (and at one time, a game that's completely free to play for a week), but I felt that they should also offer perks economically. By which, I mean that members will have much better discounts compared to the non-payers, like maybe if a game like Breath of Wild is 30% discount normally, for NSO members it's 40% discount. What they did for the Vouchers is not bad, but I felt that it should be more ongoing than that.
I am sure this had to happen sooner or later, and while I vastly prefer a perennially free online service, I can also understand why they had to resort to a subscription service eventually.
Thank you for reading.