Interesting point of view on this.
I do use Mepp's type spinner both in Q for larger species, and while fishing for smaller stream trout.

I have more line twisting issues if I tie directly to lure, than if I use a quality snap swivel?

I've also found that you need to keep swivel size in proportion to the weight of lure so it will swivel properly.

I "thought" the resistance of the lure, is what turned the swivel or should turn it.

I don't use bottom bouncer sinkers, I use the keel weight type with the chain swivels, and have had no issues with line twist.