That only works if the framework actually does work as a complete platform, though - that is, if you can get away with forgetting (or never learning) the underlying platform once. To go back to Angular, it would mean forgetting all about the non-Angular-friendly parts of the DOM, events, etc. and never needing to use them again.
I haven't written any assembly in many years now, but for a good while it was still pretty important to maintain that knowledge - you never knew when you'd need to use it for a routine here or there that was just too slow or cumbersome in C. And still, long, long after that, debugging C required at least some assembly knowledge if you wanted to get home in time for supper.
And this is where I see folks getting into the weeds with stuff like Angular: if you completely forget (or never learn) the underlying platform, it's entirely too easy to get stuck when it comes to debugging or even performance issues: you know it shouldn't take 3 seconds to render the page, but if you can't look under the abstraction then you're hosed.
So eventually, you're stuck learning the whole stack anyway. And now it's not a sunk cost: you have to forget what lies beneath every time you sit down...
I haven't written any assembly in many years now, but for a good while it was still pretty important to maintain that knowledge - you never knew when you'd need to use it for a routine here or there that was just too slow or cumbersome in C. And still, long, long after that, debugging C required at least some assembly knowledge if you wanted to get home in time for supper.
And this is where I see folks getting into the weeds with stuff like Angular: if you completely forget (or never learn) the underlying platform, it's entirely too easy to get stuck when it comes to debugging or even performance issues: you know it shouldn't take 3 seconds to render the page, but if you can't look under the abstraction then you're hosed.
So eventually, you're stuck learning the whole stack anyway. And now it's not a sunk cost: you have to forget what lies beneath every time you sit down...