Not parent, but see my sibling comment re: Docker. The issue is imo that Docker is very easy to misconfigure and gives you the wrong mental model of how security on Linux works.
On SSH password auth: its secure if you use a long, random, not reused elsewhere password for every user. But it is also very easy to not do these things. SSH certs are just more convenient imo.
On SSH password auth: its secure if you use a long, random, not reused elsewhere password for every user. But it is also very easy to not do these things. SSH certs are just more convenient imo.