I think it's a fair assessment (did I spell that correctly?) that a good revolver will shoot as well as a tight automatic. And that's the key, good revolver with resonable throat / bore dimensions and alignment, and an automatic that locks up tightly. All of which are very commonplace in today's modern guns, from Glocks to S&W's.
On the other hand, if they are loosy goosy, chances are that the gun won't be accurate.
My Hi-Power and repro Luger both shoot 1" to 1 1/2" groups at 25 yards as do my Security-Sixes, and Blackhawks. I have a Smith 25-5 in 45 Colt that won't shoot worth a darn. It does better with unsized boolits at .454 or so, and I finally figured out why, the cylinder throats measure .457, and the bore is .452, no wonder it didn't like .451's.
I also have a Star B Super, that must have had a million rounds fired through it, I even had to weld up the barrel bushing OD it was so loose, the rifling's OK, but she's still pretty loose. I can get a 3" to 4" group out of her, but that's as good as I can get her to shoot presently.
Anyway, I think it all boils down to how well the machinery fits.
Here's a couple of examples from revolver vs auto (that's a hand fitted Smith M-52 vs a Ruger Security-Six. Both guns fire these sized groups consistently)