I think a lot of the benefit is to newer divers or divers that don't dive much. Easier neutral buoyancy when you only dive on vacation once or twice a year would be worth the cost to some divers. A dive vacation is not cheap and the additional cost of avelo vs making your time in the water more enjoyable is a worthwhile cost for a lot of folks. Especially if you are diving with rental gear where you don't know your correct weights.
Every new technology doesn't seem necessary if you already are happy with your kit and everything works for you as is. I think air integration is cool, but I don't think I would spend the money as I am used to looking at my SPG and frankly looking at my dive computer instead just doesn't seem worth the cost. Avelo is the same, I think it would be cool to try and would love to lose 15 lbs of weight, but probably won't try it as I am happy with what I normally use.