Comment by RandomGuyDTB

This but unironically. I can get C code from the 70s to compile in GCC but I can't get Windows programs released twenty or so years ago to run in Win10. Open software will always be easier to support and always be more stable than proprietary software, because one invites a free community of maintainers and the other one tells them that they aren't welcome. In the short-term, writing for proprietary systems is fine, but if you want your application to be use-able after you die you should probably open-source your stuff and make it compatible with free platforms.