Performance

I know Nintendo Koll-Aid is sweet but people need to realize the Switch is not a high-end machine and any cutting edge game will not run on it.

Just check Switch Doom to have an idea of what happen when you try to make the Switch run a modern AAA game. While some gamers may be happy to have a downgraded version of a game many gamers will only remember the low-FPS mess and it will hurt the IP in the long run.

Some new releases may be light enough to run on all systems but we can't expect every new game to be a Stardew Valley.

So here is the reason your favorite game isn't on the Switch, it's because like every new Nintendo console in the last decade it just don't pack the hardware to do so.