I have watched so many 2005+ movies, where all the action scenes are just replaced with 'jiggle the screen around', and thus, you see nothing.
Worse, I've seen fight scenes with no/little jiggle, but then every move, punch, dodge, car stunt is replaced with a fast cut, so you don't actually see... well, anything.
Someone else mentioned that the reason stunt doubles are changed vfx wise, is because maybe they couldn't find one similar enough.
I call hooey on that, the real issue is cost. Generic stunt doubles are far cheaper than "stunt double who looks like top tier star".
And the jiggle cam is cheaper than a real action scene, and fast cuts are too, because who cares how well it is timed/shot if you can't see it.
I think, much like any industry, all this junk is just cost savings. It also shifts blame, and requires less talent from the director and actors.
I doubt any modern director, or actor, could handle the pressure of expensive shots, dangerous shots, with people running through explosions, or car chases, stunt doubles or not.
Nope. Just throw all that at sfx, and all the stress, cost, and reputation risking shots are no longer an actor's or dieector's issue.
Ah well.