I'm another fan. My first BC was a Zeagle Ranger. I did not like the bulk or the constrained feeling so I tried a BP/W and loved it from the start.Don't dismiss the comfort of a BP/W until you try one. If you're familiar with the "Dog Beach death march" (big Island in Hawaii), the BP/W and tank were the most comfortable thing about getting to the beach. Again board shorts and a rash-guard. Once you try one, the feeling of freedom with nothing on your chest while diving is hard to believe.
Like you (and a lot of people doing the switch), I was concerned about the comfort and adjustability of a basic harness, so I started with a deluxe harness. That was another waste of money, the attachment point for the chest strap dug into my chest and the narrow crotch strap was both uncomfortable and didn't offer much support. Finally, I swapped it out for a standard harness and am much happier.
The 2" webbing is wide enough that it does not dig into your shoulders while walking in the rig. The way it is supposed to fit is to keep the shoulder straps a little loose for comfort and to aid getting it on and off. The crotch strap keeps everything in place while diving.
As far as I'm concerned, the only drawback with a BP/W is the lack of pockets. I use a couple of trim pouches on the waistband for the small amount of weight I need with AL tanks in warm water, but everything else (DSMB, light(s), sometimes a small camera or slate) needs to be clipped on or wrist mounted. This is fine once you've had a chance to practice with it. People who want to carry more stuff tend to get tech shorts with pockets or add pockets to their wetsuit or drysuit.