when you do have big problems its still kind of annoying

Or small problems. Very annoying small problems. Like GTK 4 windows freezing when you try to close them.

As long as the kernel keeps supporting loading and executing processes with 32-bit code, they don’t even need to go that far. There shouldn’t be much stopping Valve from just supplying libraries themselves inside a container. In fact, that’s what the Steam Linux Runtime “Sniper” does.