> something can't be justified, it's probably not worth doing

This is the problem, really. You don't maintain the formula in Homebrew, we do. When things break we receive the issues. When we change the way some Homebrew internals do, we need to update the formulae. Whether it's good or not, we're the gatekeepers. If you'd rather this wasn't the case you can move Frescobaldi to a tap and keep it in whatever style you'd like and not have to deal with us again. Until then you need to deal with us on our terms, I'm afraid, as we have many, many more PRs to handle than you do.