I just refuse to re-buy anything on Switch that's already been on Wii U, or even Wii. Sadly, when you take away the rereleases their first party for Switch has actually been quite weak, and the system is largely salvaged through having the best third party support for a Nintendo console since the SNES.
I have also refused to buy any of the retreads. Unfortunately, as I enjoy the core Nintendo IPs, that has left my Switch mostly collecting dust. I've played only three big games on it - SMO, Mario Maker 2, and Mario+Rabbids. I played BotW on WiiU. I have Yoshi's Crafted World, and will probably play that soon. But, that's pretty weak considering that I bought my Switch around launch. Beyond those games, I've only played Sonic Mania and one or two other little things while traveling. Really, it has been a big disappointment for me, and may be the last Nintendo system I buy. I damn sure won't buy the next one anywhere near launch.
Also, the lack of a new Mario Kart is really unacceptable.