The tiny market share would be OK if it were some kind of vanguard or reference for OS development.
I think that is how many Linux people see it.
But I suspect this is an illusion.
Linux may be a good server system.
But as a Linux desktop user you place yourself BESIDE (not to say outside) the "common reality".
The question is: Are you ABOVE reality as a vanguard or reference?
I doubt it.
See my other point about Integrated Development Environment.
Linux is not an exclusive platform for free application software development since the 2014 introduction of the Visual Studio Community edition, followed by 2018 introduction of the CB and Delphi Community editions. Xcode on Apple is today also a completely free download for everyone.
I recommend to read the articles on the C++Builder anniversary site for background about special requirements for GUI application development which isn't Linux's strong point.
Yes there is different understanding of free, but responsibility is an important value as well.
It is also interesting to watch the Long Term History market share.
I don't assume that the apparent decline of Windows and rise of macOS will continue linearly, although Microsoft try their best with the mentioned Windows 11 usability regression 
, but I recommend to keep an eye on further macOS progression... 
Regards
Guido
JPEG developer