The System Shock remake from Nightdive Studios was originally funded on Kickstarter, and after delays it was eventually released on May 30th, 2023 but two platforms have been missing - Linux and macOS.
There are some very vocal people who will tell you that proton is just a stopgap measure, and shouldn't be relied on for the future of Linux gaming.
That said, I know the devs have been putting in effort/patches to make sure the proton/steam deck experience works well, and I consider that just as good. All I really want from devs is actual support of the Linux platform, and if they choose to do that through a tool like proton I'm ok with it.
Given that a common subset of the Win32 ABI is now a reasonably efficient virtual machine for running PC games on Linux and (soon) macOS, we can probably expect “do Mac/Linux ports” replaced with “make sure the Windows .exe runs on Mac/Linux”