I got the switch 2 and day one and I've mostly been playing the deck since then. There isn't much on the switch (besides mario kart and donkey kong), and the stuff that is cross-platform doesn't run well (the new "it takes two" is really laggy).

A Switch and a Steam Deck are orthogonal purchases.

I’ve been having a lot of fun with my Switch 2, but due to its size I find it far less ergonomic than the original.

I spent like 98% of my playtime on the original in handheld. That has switched completely. It’s not just the size but especially the weight I think.

May as well replace all of your apples with oranges while you're at it.

The Switch 2 and the Steam Deck are hugely different machines, despite sharing a form factor.