While the point you make is correct, they represent a way to do things that you prefer. I am trilingual and have multiple keyboards setup. I know there's many way I can enter special diacritics, and that some are faster than others (my name actually contains an accent not "natively" on English keyboard).
The accent menu has been available to easy find special characters in macOS for years (if not over a decade) and is officially supported by apple (Enter characters with accent marks on Mac - Apple Support).
That does not change the fact that this thread is about trying to fix a common bug in Ventura, not trying to convince people to change the way they use their keyboard. It's great that we get (reminded) about alternative ways while the bug is still in place.
That said, I am also experiencing the bug, and I do not have Webroot nor Lifelock installed. Turning on the Full Keyboard Access in Accessibility settings does not fix it for me either, and neither does setting the defaults (as suggested in the original post), so I'm still looking for fixes!