So, who is black, and who is white?

The commands to update are not the issue.
What many is mistaken about is the fact that things may break once you leave official channels.

Those who regularly use Linux distros knows this fact.

It is, once again, connected with risk every single time you update, but the fact iis - this is more related to unofficial builds, apps, or system patches, which Jolla can't, and won't ever guarantee won't break something.

If users are on a 'plain' distro (sailfishos) these three commands won't harm anything.

True, things can still go wrong, just like when the patient once chose to wait. Unexpected power-off while upgrading, loss of connectivity. Or (hrm hrrmmmm) bad battery!