Has it really been that long? Apparently so. Valve originally announced their rebranding of Steam Play with Proton back on August 21st, 2018. Seems like a good time for a quick reflection being halfway to a decade old now with the tech that gave rise to the Steam Deck.
Yeah, it was a pain to get it working but when you had it, it was almost flawless. I had hundreds of hours clocked on League of Legends, Diablo 2 and Diablo 3 before Proton even existed. The native port of PCSX2 used to suck hard and I used it on wine for years too.
I agree with what you said and I don’t understand why you’re being downvoted. Harder than with Proton? Yes. But gaming with (plain old) wine was already a thing before Proton.