F-Zero is because Miyamoto can not figure out what to make if Mario Kart 8 specifically took on the role of F-Zero with the anti-gravity and 200cc additions to 8.. F-Zero needs a reload / gimmick to separate from Mario Kart 8.
Star Fox has long been tarred by derailing the Star Fox Adventures franchise. Nintendo tried to recreate Star Fox 64 and restart Star Fox 64 so as not to revive the series (the latter only failed because Wii U and hardcore gamers refuse to leave comfort zones). Ubisoft’s use of Star Fox could not even do anything. Star Fox is pretty dead. Maybe Nintendo can try to reload the series in thirty years (Nintendo will release Star Fox 1, 2 and 64 in the meantime over and over again).
Kid Icarus is mainly because no one is available, and if anyone was available, no one made a successful place for a new Kid Icarus game. Sakurai has temporarily revived the AI franchise, but he does not want to return to this franchise. Rebellion did have good sales, but it received strong criticism from the control panel and Nintendo may feel that the Rebellion on a newer platform with better controls and a better multiplayer balance is not the answer to the interest in Kid Icarus too revived.
All other small IPs are IPs that just met expectations, or fell short. Some of Nintendo’s new 3Ds from the 3DS era are missing in operation for Switch. Mallo and Pushmo have not been seen since Wii U / 3DS. Sakura Samurai has not had a new game since 3DS. There are numerous other examples.
If no one buys these little titles, Nintendo has no choice but to make Mario, Mario Kart, Zelda and Smash Bros. games (with the occasional Pokémon game from The Pokemon Company). Yes, that means buying games you don’t want, like Paper Mario: Origami King and Star Fox Zero (Wii U).
By not buying small games and games that change the formula or have non-traditional controls, you see Nintendo in a third-party production role they do now (after all, people wanted Nintendo to go third-party and now we see them in a third-party production frenzy with few games outside of Nintendo’s primary AAA games).