I wouldn’t call Hydros simple. You have 3 dump valves to check, clean and service as opposed to a single kidney dump on a normal wing - major risk of a buoyancy loss if one fails. Inflator is some custom design instead of a standard K-style power inflator - where can I get tools to service it or replace an o-ring? Obviously the ditchable weight pockets are a good way to embolize yourself on any marginally deeper dive. Harness is non-standard, probably not easy to replace and OMG the plastic buckles. Also the harness is not fixed in place so you need to adjust it before each dive? Tank is attached only with a strap and a single camband, compared to a standard and more secure attachment with two cambands on any regular BP/W setup. Backplate seems to be made out of plastic??
You asked for DIR dogma, I’m delivering
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On a serious note, I would either buy the cheapest, possibly used recreational jacket BCD you can find or a proper backplate and wing with no gimmicks. Anything in-between will include a compromise.