How many times do you see the pro's tap down spike marks after they miss a putt? I see it a lot. You can also see them from the worm cam when they show the putt rolling towards the hole.
They do pull up grass even with the pro's wearing them. Soft spikes don't. We occasionally get damage from the SS when someone does the twist & shout after a putt, but nothing like the old spike marks.
It doesn't matter how dry the course is kept, it still rains occasionally.
Soft spikes carry at least as much poa seed as metal spikes do.