Why aren't there 3 games on NSO?

Super Smash Bros. You could say is because of Ultimate, which is on Switch, but then, why are there the classic Mario Karts if they'd just want you to play the most recent game?

"But Smash 64 and Ultimate are basically the same game" No? Smash Ultimate is Definitely Superior is nearly every way, Smash 64 is still its own game, there are people who still want to play Smash 64, maybe they want to see where it all began. Plus, if they wanted you to play the newer games, why was the game on Wii VC? They could've just left you with Brawl and Only Brawl, after all, not only was it the superior game, but a retail game, meaning they would make more money from it, so if they decided to re-release it then, why not now?

DKR and DK64 straight up just don't make sense, the other Rare DK games are on NSO, so why not these 2? DKR You could say it's because of Conker, but if Microsoft let the big N borrow Banjo and Kazooie, why not Conker? It was released for the first time on N64, same for Banjo, so why not? Heck, While they're at it, Put BFD on the Mature Games app, I'm not particularly asking for that since I have Game Pass and an Xbox so I can just play it on Rare Replay over there, but people who only have a Nintendo Switch would still be able to play it legally without requiring an Xbox. Oh, and that logic doesn't really apply to DK64.

"Nobody likes DK64" I like DK64, there are other people who like DK64, sure, there are many people who don't like it, but how is that a valid reason to not put it in?

"100%ing DK64 is hell" There is an easy solution to that, DON'T. You don't HAVE to 100% every game you own, sure, if you absolutely LOVE the game, I can see why, but it's not required! Completing the game Regularly is fine enough!

So yeah, that's my little rant, I'm just expressing how I personally think the Absence of these games is really confusing considering they are first party titles, and don't take any of what I said as me hating on Nintendo for not putting these games on NSO, I'm not gonna have mental breakdowns over this, I'm just mildly upset. Anyways, Cya.