You might be able to attract new players that don’t have any baggage, but older ones with games on Steam, you’ll need to climb the Everest to convince them.
At this point, my Epic library is technically bigger than my Steam library, even with family sharing somehow? But its a bunch of free games I don't care about, except for a few, and steam has modding features built right in, so one of the few games I have played after getting it free on Epic, I eventually bought on steam when it went on sale there. There's also the history of achievements and friends (and sharing of games with those in my steam family). So if I had to pick between Steam and Epic for a game, I'd pay more for it to be on steam. Still, I'd rather go with GOG or itch if I didn't still have steam credit from gift cards.
I haven't had too much issues with Bazzite for general use. I still use windows for work, so there's some things I haven't tried setting up and have no clue how different they'd be on an immutable vs a mutable OS.
I've used Mint before (like 10 years ago) and somehow it kept breaking (I'm sure I somehow caused it, but I only knew enough to break things and not enough to understand how I was breaking them). 🤷♀️ For most people, I'd think how Bazzite works would be acceptable. For some power users, the immutable OS aspect might be annoying, but I think that's mostly an issue for people who are coming from a different Linux distro (it did bother me at first and I did consider switching to something like PopOS) or people who want to run fairly dated or obscure software (granted, VMs are sometimes already necessary for that - at a previous job, we had to use windows 95 VMs to run a specific version of software).