> The truth is that the OS usually hides the latency of wireless heapdhones, e.g. airpods, by delaying video to keep it in sync.

Right, but that only works when you control both. I love my Sony and Shure Bluetooth headphones and have 0 issues watching videos with them; they work great even on Linux.

But when people figure they're gonna use BT headsets for conferencing, it just turns into a shitshow of people waiting for the other to speak, then starting to speak at the same time.

I have an old Jabra headset for my video call needs, and it uses DECT. That thing has so little latency that I can use it to play FPS games without issues (I'm by no means a competitve player, so YMMV). At the same time, its range is huuuge. For the life of me, I cannot understand why nobody makes such headsets anymore: they've all switched to BT for some reason. The only models that seem to still use some form of low-latency transmission are some "gamer" models, but I've never tried one.