You should have backups. Not hedge against 1 in 10 million error conditions.

if a partition isn’t actively written to, it’s less likely to suffer damage

The second one is a huge bother in desktops. I never not regretted trying it.

ok

The third one is a complete non-problem.

This is only a problem with OpenBSD. They never encourage using a huge single root partition, and never test it.

It have an asterisk, not a -