So suddenly Blender started to glitch when I create a sphere and put the shading on smooth.
I have no clue what happened, I had Blender installed on the same system and suddenly this glitch appeared. I tried to remove Blender and install older and newer versions, this problem is in all of them. Which is super weird in itself, since everything was fine until now (I updated Blender to 2.82a).
So it seems many people report this as a bug for years now but still no solution. There are suggestions to add a sub div modifier or add more geometry, but that seems rather complicated for such a simple thing? Eevee is fine.
Any other/new solutions to this?