If you ignore the risks I don't see why it's hard to see value.
The AI can read all your email, that's useful. It can delete them to free up space after deciding they are useless. It can push to GitHub. The more of your private info and passwords you give it the more useful it becomes.
That's all great, until it isn't.
Putting firewalls in place is probably possible and obviously desirable but is a bit of a hassle and will probably reduce the usefulness to some degree, so people won't. We'll all collectively touch the stove and find out that it is hot.