I'm not convinced that burning out trying to change something that's unchangeable is the right strategic way to fix things for anyone other than the company. I

I'm not convinced that burning out trying to change something that's unchangeable is the right strategic way to fix things for anyone other than the company. If enough people leave and go work on next-generation things because the previous-generation has run it's course - that strikes me as having many parallels in nature. Large companies don't adapt quickly unless they have a true (ie, in-practice, not just in-speech) mandate to do so. A leaf contributes to the health of the tree, but it doesn't control where new branches grow.