How much more difficult are tests I don't know. Are they really that complex can you give me an example
React has hooks so for basic apps it does not need state management libs and they have so many libs that you may choose one in complex apps that is not as complex as redux and redux also has gotten a lot better with redux toolkit. Same redux pattern is used in angular too in ngRx
What do you mean by pollution. I can say the same thing for angular managing so many files is difficult.
I just want to say I like Angular Its great for changing teams as most of the architecture is same but just depends too much on the core team for innovation