Earlier quoted context omitted.
>With hardware remote attestation there will no longer be any point in even owning an android phone anyway. Android is obviously inferior to iOS in every way but the whole point was you could have control over the machine and do whatever you wanted. Now apps will be able to verify that you "tampered" with the phone and will refuse to run, and since it's hardware cryptography it cannot be faked without massive effort.…
It won't become impossible to install a custom rom, it will simply become impossible to use many if not most popular apps. Android already provides a mechanism for apps to refuse to run on modified devices, it's called SafetyNet and is widely used for example by banking apps. Currently, it's usually possible to trick it, but with hardware attestation it will become practically impossible.
The simple solution --- install the bank's web site as an app.
Go to the site, click the browser menu button (3 dots on Android or up arrow on iOS) and select "Add to Home Screen". You now have a link icon on your phone that looks and acts just like any other app.
Some banks (Chase for example) offer a "Progress Web App" which removes the browser interface elements so the causal observer can't even tell it's not a native app.
https://www.howtogeek.com/342121/what-are-progressive-web-ap...