There are a couple things to keep in mind (and I was also surprised to learn that BT connections were an issue at all, but have since learned a bit more):
HA bluetooth is not the same as normal bluetooth connections. There’s a reason typical bluetooth headphones only have a few hours of battery life; they suck energy like crazy. HAs need to be designed to at least last all day (rechargeables, at least). They use a low energy protocol when connecting with phones, and they’re tasked with doing much more than standard headphones, so with Androids, they have yet to find a good balance between battery and BT signal strength. Given some time, I think the ASHA protocol will be smoothed out (I would hope, at least) and connections will be better and more stable. Also, LE Audio is on the horizon, granted it may take some time before that’s really a full environment in day to day life.
I would imagine that the focus of HA companies is on sound processing technology first. While a lot of us consider BT to be pretty essential these days, it’s still a secondary consideration if you think about how many problems people still have with hearing even with aids. So even though I lament on the current state of BT in HAs, it’s still a nice-to-have feature, and the importance of quality of life with the ability to hear and understand still takes precedence. Honestly, I’m also considering switching to an iPhone. That alone might improve BT connections.