I still have yet to understand why everyone thinks they need want a backplate wing vs a traditional bc. It doesn't make anyone a better diver, they generally weigh more, cost more, and provide nothing different than a back inflate bc.
FWIW, all I do is the typical 50-60 vacation dives in tropical waters and recently went to a travellite cressi jacket style and I love it.
You can get a complete BP/W package from DGX for around $400. That’s a lower end jacket in todays market. The BP adds some weight which is nice and all allow for two cam bands for tank security. Most jackets have a plastic mounting pad or plate with one cam band, usually with a plastic cam buckle that eventually gives way and distorts and in some cases with heavy use will finally break. Jackets also have a lot more padding which is counter productive under water, they require extra weight just to sink the BC.
On a BP, D-rings can be added or subtracted and placed anywhere along the webbing where desired. Jackets do not allow for this.
Wings are interchangeable for many environments, jackets do not allow for this. Webbing can be swapped out if wear occurs (which is very seldom) and also a one piece harness can be used with no plastic clips. Jackets are sewn together one way and you do not have a choice for where they decide to put D-rings and clips.
Most wings have a zipper so the inner bladder can be accessed allowing for bladder repairs. Jackets do not allow for this. Jackets normally have a single walled bladder that has a urethane coating on the inside and no way to access the inside so repairs need to be done on the outside. This is akin to putting a tire patch on the outside of a tire.
However, with all that said, if I was a new diver with no money and found a jacket that fit and was in good shape at a garage sale I would buy it and dive the crap out if it until it completely fell apart.
I’m for whatever gets people in the water, including used gear and poodle jackets even though they may not be particularly optimal, but it still works.
It’s better than nothing.