Update: I was dead set against cutting blocks wet, until a job in Phoenix changed my mind
For years I ran dry on every block job and figured wet cutting was for guys who couldn't keep a straight line. Then last month my helper talked me into renting a wet saw for a 1,200 block commercial wall outside Phoenix, and I ate my words by lunchtime. The dust was gone, my eyes stopped burning, and I got 90 blocks an hour instead of 60, with a chunk of that gap being the cleanup I wasn't doing. What really got me was the blade, since the same one that was halfway shot on dry cuts went through another 400 blocks after the water was hooked up. I still think a wet saw is overkill for a small patio job where you're cutting 30 caps and a hose is a hassle. But for anything over a few hundred units, I get it now. What's your cutoff for dragging the wet saw out versus just grabbing the grinder?