So, is it possible that a diver would just prefer a harness with adjustable straps and quick releases?
Sure, after all, almost everyone who makes a harness offers an adjustable "comfort" harness too. If you have the fortune to live close to an LDS that stocks both, just try both out and see which one you like better (and, if you're looking to take advanced classes in the near future, talk with a few instructors and see if they have any insight on either).
The one-piece harness is one of those things that I think truly tends to work well, but it does take a bit of faith in the beginning and some effort to "grow into." The adjustable harness is immediately intuitive and comfortable for a lot of people. It's kinda like manual transmission versus automatic (and yes, if you start getting into the engineering and fancy multi/computer-controlled clutches the analogy is imperfect). But in the end, it's your money, go for what you want
