Heres the thing, its a cost you pay for every single project you start and every change you make to your build system. Emacs makes it possible but hard to maneuver, by my reckoning.

There are some really giant projects where that becomes reasonable, but for me thats just not the case. And if I were going to invest time like that, I'd rather invest it into an environment which has a higher ceiling for what it can do (emacs doesnt provide fast/rich/easy autocomplete, for example)