on my Oneplus 3 the bluetooth connection with my old pebble watch lasts only about 10sec and then it's disconnected again...
and wifi is still unreliable, after a reboot the smartphone sometimes does not connect to my network - so I have to stop and start wifi and then it works
and I'd love to use the fingerprint reader in the future
I'm on Ubuntu 16.04 (2020-06-10)