2020's iPhone 12 had been found to be very independent repair-unfriendly by a prominent Australia-based vlogger. Now, a follow-up video asserts that this situation has gotten even worse in 2021. Replacing some components apparently causes more iPhone functions to break, some of the 13 series' newest features included.
https://www.notebookcheck.net/Apple-may-have-gone-even-further-in-blocking-third-party-repairs-with-the-iPhone-13-series.568460.0.html