How fast do you think a startup founder would get laughed out of an investor’s office of he started his pitch with “I have this great idea for a Windows Application”?
On the development side, it would be crazy for any developer to tie their horse to .Net Framework when MS has publicly said that it is in maintenance mode.
There were still a few jobs for Windows CE developers as late as 2014 even though MS abandoned it after VS 2008 (2007?). It would have been foolish for me to take such a job.