Genuinely might just be unawareness. I have been using safety razors for a long time, but I was only introduced to it by a forum post somewhere long ago. Nobody I know personally (especially in the family) uses them. Stores in my area don’t stock razors or handles. It was just by chance that someone posted about them and that I saw that post that got me to switch.

I’ve done it twice so far (main server and a Raspberry Pi). Although I recall I had some package breakage with the main server (some changes in Podman that did not go well with the migration to pasta, the new rootless network stack), the process was mostly pain free and I could fix things remotely with SSH.

If you mean harvesting tidal energy, the effect on the moon would be minimal. The loss of angular momentum the moon experiences is due to the mass of the earth’s waters. I could not imagine anything humans could build that could extract enough tidal energy that it would disrupt the moon without utterly destroying the environment at the same time (by way of nullifying tides somehow). In fact, to harness tidal energy, one way would be to use underwater turbines. They would have an immediate effect to the local environment but a negligible amount to the moon itself.

The opposite happens. Tidal energy is what causes the moon to drift farther away from the earth, as the moon loses angular velocity.