I think this is ultimately a benefit. I've had too many proprietary native Linux games that slowly broke overtime as libraries they depended on changed or became deprecated. Hosting unmaintained proprietary software like this has always been difficult with Linux.

With Proton we basically have a common stable runtime that handles all the platform specific needs of a video game. It just so happens that runtime is largely binary-compatible with Windows. It's easier for devs to support when all they have to do is stick to a Proton-compatible subset of the Win32 API. Users get way more games. And anecdotally my experience as a user is generally better than with true native ports. It's a big net win.