What Gary S says.
Once you have fire control down cooking with a dry pan and HH is about knowing what "done" is. The window becomes much shorter with HH methods that's the challenge.
You can pass "done" very quickly. LS and water in the pan slows things down tremendously and stretches the window out. You have a longer opportunity to pull the product at the right time.
HH is not the be all end all, there will always be some things that are better done LS. But for ribs, brisket, pork shoulder HH or "higher heat" is fine. I used to do successful overnight cooks. Really not required as I've found out over time.
Found that out learning from MVP's on this site.