...game studios have no reasons left to bother with native Linux clients.

How many game studios were bothering with native Linux clients before Proton became known?

That's exactly the point. They weren't, so a Linux user didn't have an option to run a native Linux client in preference to a Win32 version.

That goes back to address the original question of "But would you want to run these Win32 software on Linux for daily use?"

More than now, I own a few from the Loki Entertainment days.