At the risk of getting flamed: I just switched out my single piece harness for one with a quick release buckle
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To me it makes a good backplate system even better - for me. Easier to doff & don by myself in cold water gear (<48 F). And my point? BP&W are just about infinitely customizable. You can fine tune your system to best match your environment and needs.
You like pockets, you can add them. You like to dangle things like a Christmas tree, you can add D-rings to your heart's content. You can get wings to suit the diving you will do. As a modular system you can make the system fit your diving. And you can switch your rig from cold water doubles to a warm water single with very little effort or (relative) cost.
One bit of advice I will re-iterate: Mark your webbing with a sharpie. If you make changes it makes it easy to go back.