I don't have any experience with Angular in particular, so take this with a grain of salt, but in my experience most frameworks, especially the ones who say, "here's the [framework] way to do such-and-such" are very tightly coupled.

They do a great job of getting you to 80% of your goal REALLY fast. The next 10% takes some work but is doable. But that last 10% is so hard you inevitably want/need to throw away the framework and write it from scratch.

Think of the Unix philosophy. Many small tools that do one thing but do it really well. Use those small tools in conjunction with each other and you have a very flexible, loosely coupled, and powerful system.