My pixel 4a lasted about 3 hours before the update, now its about an hour. Even with the discount in the store, it was cheaper to get the pixel 8a and some cash from a local vendor. The ticket to get the reimbursement went surprisingly fast, still waiting on money though.

Yesterday I got my new 8a, installed grapheneos and it works very well! So far no massive issues. When I tried this on the 4a some years ago, netflix complained about general certificate stuff and casting was broken, microG et al was barely holding on. Now, no problems at all!