IEC 60906-1 That is not a reversible plug which is annoying at times.

It takes less force to plug in. Above 2.5A, Schuko plugs require a lot of force to plug in and pull out. To some extent, this is actually good for safety, but I would argue that, in the case of Schuko plugs at least, it’s too much Hmm, I get what you mean and this can be an issue and it’s probably the reason why plugs without grounding exist since they are easier to pull out.

It is also easier to plug in without seeing the plug since it isn’t round. Everyone who has tried to plug in a Schuko plug without seeing the holes knows how difficult it is Never had this issue

I didn’t even know there are different three-phase power plugs, but then again you rarely need those compared to the normal plugs