> i disagree. unless intuit is also rewriting quickbooks, dassault systèmes is rewriting solidworks, every bank is rewriting their custom windows-only software, every government branch is rewriting their custom windows-only software

Up front they won't need to do a full rewrite. They'll only need to make it work well enough under Wine.

At a source level, tools like Avalonia's xpf make porting WPF apps to other platforms easier:

https://avaloniaui.net/xpf

of the stupid enterprise-y software like quickbooks, solidworks and other proprietary stuff that i have used, they barely work well enough under native windows. not to mention, even sticking them in a windows VM voids any support contracts.