The Angular API has been pretty stable for the past 6-7 years since v2 (well, since v4 if you count the Router changes), and the upgrade process between major versions is pretty smooth. Especially since the Ivy release, they've matured a lot... That's one of the reasons I still prefer it over React, especially in enterprise settings. (Although with their latest versions they are again trying to keep up with the cool kids by introducing standalone components and signals... not sure what to think about that yet)