> and pushing them towards adopting more off-the-shelf components instead of maintaining homegrown stuff

Are you spending your time second-guessing the developers and micro-managing them on the exact thing they are supposed to be experts?

Your phrasing has that "feel", but it's far from a sure conclusion. Anyway, if it is the case, you may need to reevaluate both your hiring (should you get more senior people?) and management (this is a clear "should never be done", unless your people are explicitly under training) practices.