For guns with sights fixed directly on to the barrel (revolvers and a very few semi autos), you are mostly correct, but even then no gun can ever possibly shoot like a laser beam, it's just physically not possible.
For guns with sights fixed to a reciprocating slide (almost all semi autos), you are mostly wrong: Lockup matters.
BUT still , the worst of pistols with the loosest, slopy, rattley, frame to slide and hardly any lock up at all, is still more precise than any set of tactical sights




















































