Front wheel issue

[ChristoT]

That all sounds good
But I still dont get it, because the pistons go in depending on how thick your pads are. So thicker pads wont be pressing on the disk any more than thin ones would.
isnt it ??

The piston can only retract so far. And don't forget latent pressure in the system.

The disadvantage of hydraulic brakes is plain here: they don't actively disengage. So there's always going to be a certain amount of friction to overcome to disengage them, and then run the wheel past them. Cable operated brakes don't have this, as they spring back with the lever.