The sprint stages aren't at fault per se, but the insane tight routes going into the sprints are.
Where are my wide road sprint finishes in major cities I grew up with when watching the Tour 20+ years ago?
Maybe I'm just angry, have forgotten past races from decades ago & I've been drinking too much this evening (hey, something I've been hyped for since late last year has been ruined now) but check out this one from 1997:
i.e. Cipollini for the win on a straight road, bossing the sprint like he usually did. Compare that to the crash bait narrow twisty GC grinder hell Prudhomme & co serve up these days.