I think that maybe part of the knock on "wireless" speakers.
Sonos works over WiFi and can transmit much more data much more quickly at a much greater range.
Bluetooth speakers are low power, low data and low distance.
Putting any BT speaker in the same category as a WiFi speaker is apples to oranges, albeit in the outdoor portable category, it's the only option.
Truthfully, I dislike BT sound so much, I have a rechargeable speaker that I plug a phone into rather than use BT.