Not always, the mister would need more elements to do an actual 1:1 for many newer consoles and the cores are often reverse engineered best guesses and not replicating the original asic design.
On the other hand, original hardware goes through revisions and the silicon can change (snes 1chip vs 2chip for example) while still be perfectly compatible so it really depends ho much of a stickler you are.
Still on archive.org so I’m not worried but I still hate to see stuff like this happen because of the precedent that it sets.
On top of all the great suggestions here I’d like to point out that the deck is a great emulation machine. Everything up to the ps2 era runs flawlessly but it can also do pretty well with Wii u, ps3 and Switch emulation too but performance will vary from title to title.
It’s also a great fallback in case the deck gets unhappy about not having a network connection (YMMV but some people have pretty bad issues with this) and steam games won’t start. Non steam games work just fine regardless of whether or not you have an internet connection.
All of the random BS it requires is a bit of a turn off but the 10ish percent drop in gaming performance is a no go. Linux with proton should outperform the os the games are designed to run on but here we are.