It’s a protocol that supports streaming to essentially one brand of hearing aid as opposed to LE Audio which will support low-energy streaming to about a thousand times (yes, I pulled that figure out of the air) more potential users. Its low uptake is not a surprise. Apple and Google also manufacture ear buds by the way. That synergy is a huge incentive.
Yes, it may appear on flagship phones first, but once it’s baked into the OS- and not just as an exotic ‘accessibility’ feature- it won’t be long before every new phone will have it.
The main issue for me is that as a hearing aid user, overall audio latency (not just Bluetooth latency) is extremely important. I’ll be looking for a lot of improvement in that area- especially from Android phones.