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One of the reasons Steam held out for so long was that a lot of the games they host are 32-bit only. Games are built by a company, many of which have gone belly-up, so rebuilding the game from scratch is impossible. Making Steam 32 bit even though it could be 64 bit is a really effective way to guarantee a large chunk of their legacy products will still run. In a lot of ways, because of the nature of the gaming industry, Steam has it worse than most package managers/app stores.
I don’t think it works like that. 64 bit Steam can manage 32 bit games just like a 64 bit OS can run 32 bit games.
I’m not sure as that’s about Steam the client though not on Proton thus Wine, which I bet will keep on supporting 32bit apps.
Remember that the portion of Steam users that use Proton regularly is less than 10%, if you include Deck users. That number is rising and is probably a major factor in the decision to switch, but it’s still a minority.
It still doesn’t matter for the Steam client. All it does is point to games and tell them to boot. The client itself doesn’t act as a compatibility layer so the 32-bit vs 64-bit game argument isn’t relevant