How would ARM Macbooks impact developers?

Macbooks are used extensively by developers, and since Apple is moving away from Intel to ARM architecture, I'm curious as to know how it would affect the developers using Macbooks as thier daily driver.

* Since Apple has clearly laid out plans for developing for the Apple platform, it would be really painless. But how smooth would be the transition ?

* What about independent projects such as Python, Erlang and frameworks such as Tensorflow be affected while running on ARM Macbooks ?

* What about Apps that use CPU specific instructions running via Rosetta ?

* Should a developer buy an Intel Mac right now or wait for that ARM mac to hit market ?