Account abstraction is very important for the flexibility and enhancement of a blockchain so account abstraction have some of the basic principles regarding its functionality as you have also explain but in a very brief way so I suggest you that you should write more in question number 1

If I talk about by keeping in mind usability of the blockchain then implications for adoption of account abstraction are user friendly experience on the blockchain I agree with you and it is also very important as well as you have also explain some of the very important methods in question number 3 and last but not least I agree with all the disadvantages that you have explained so over all it was good over view of this topic but it would be much good for you if you would go into more depth for the very next time