I can attest that using free software is not ruinous to productivity - least of all in the field of software development itself.
You don't have to fix every bug you find. Just fix the odd bug, and work around the rest until somebody else fixes it; many hands make light work. But the work doesn't get done at all if you run away to proprietary platforms.
You don't have to boil the ocean. Just do your civic duty from time to time. Once a year, even. If everybody on HN used desktop Linux and, once a year, invested an hour into fixing a minor, polish-level bug, desktop Linux's polish problem would completely disappear.