> No, it isn't.
Well, let's see. My main 3 purchase locations are Steam, Humble Bundle and GOG.com. I'd guess this is fairly typical, but anyone using other platforms feel free to add yours.
Steam: The Steam client is still stuck on 32bits. I'd bet it will soon be updated to 64bit, but it just goes to show that macOS is pretty low in the priorities of Valve. And if a company with the resources of Valve doesn't care, I can't see much motivation for the individual developers either.
Humble Bundle: I've went through the current and following Humble Bundle Monthly games. Windows Only: Call of Duty WWII, Crash Bandicoot Remastered, Spyro Remastered, Sonic Mania, Planet Alpha, Override-Mech City Brawl. Windows+macOS: Battletech, The Spiral Scouts.
GOG.com: There's already a 64bit DOSBox port—DOS–era games will eventually be supported. Windows–era games are gone—Catalina breaks Wine emulation and no announcement has been made for 64bit support by the Wine Team. For newer games, GOG.com will need new builds from the developers—doubtful if we ever get to see those, especially for indie games where developers don't have the resources to go back and port their released games. Newly released games are often Windows-only.
I don't know how you see this picture, but it looks pretty bleak to me.