Can you give any reasoning for why Gentoo would be an optimal easy approach, as opposed to maybe, SELinux for example?

When I am in an advisory role, with my own reputation at stake, I must always recommend the hard choice known for superior long-run results over the easy thing with fast but inferior long-run results.

Doing the hard but superior thing builds competency in doing the hard but superior thing, which makes it easier to do the hard but superior thing over the long run.

Contrariwise, doing the easy but inferior thing builds competency in doing the easy but inferior thing, which makes it easier to get stuck doing the easy but inferior thing over the long run.

Pardon what may seem like hyperbole, but recommending inferior solutions to others because it's easy feels like, to me, malicious incompetence.