You know, I'll have to add to the disagreement. Because of all the technical reasons yeah, your way would stop language development, but also because herding cats is a really counterproductive thing to do, every time somebody powerful enough to get a chance tries it, everybody loses in the end. (But you are free to keep thinking this way. Of course, I won't change to your preferred set, but if you want to reduce fragmentation, you are free to surrender your preferences.)

Anyway, perftools are only a must have when performance becomes a problem, step through debuggers are way overrated, there are many features that no amount of libraries or tools will give you, and ecosystems quality matter about as much as size.