For what it's worth, I've played around a good bit with Bluetooth, both on headphones and with speakers. I don't have enough equipment to make a universal statement, but I think that since BT 3.0, the improvements have come from other factors in the chain, outside the Bluetooth standard itself.
3.0 and above has enough bandwidth to deliver a good digital signal. The ability to pair a tiny, high quality DAC and amp in a headphone with good, sensitive speakers, in a package you can wear comfortably on your head is what has come a long way in the past few years.
In my experience, aptx doesn't make a difference in sound quality. What it does do better is decrease latency. My first pairing of two aptx devices was the first time I had a satisfactory experience watching a video with BT headphones. (but please don't take that as an excuse to lock oneself in the overpriced Apple ecosystem).
For most people, I think it's entirely possible to have a highly satisfactory wireless "stack" as a primary listening setup nowadays.