Firstly, my Pixel 8 completely died on me when I switched to GrapheneOS (the phone is to blame). I returned it and then bought the OnePlus 11 for half the price of the Pixel 8. (Pixel = £599, OnePlus 11 £349 from eBay)
There’s nothing wrong with the operating system itself; it’s just the limitations of the devices. I don’t think Google Pixel phones are worth the money, even though they have one of the best cameras. Besides, I don’t see the point, especially when you can get phones that are equally good (except for the camera) for a cheaper price.
Yes, I have been trying different ROMs including LineageOS, but you’ll need to install GApps. but you’ll need to install GApps. Most bank apps rely on Google Play Services. By the way, jailbreaking iOS is similar to “root” on Android. Installing a custom ROM doesn’t necessarily mean your phone is rooted. So, you shouldn’t be concerned about that.