No echo in calls.
Bluetooth calling does not workon this rom. Bluetooth speaker pairing works for music only. If you need bluetooth calls, then Astrako's H-ROM A7 Port V6.0 is your best bet.
Video recording Ok with the stock (lineage) camera and Footeji, both of which suit my needs.
This is still the best Rom available for the A3 2017 in 2021. Personally a 4.7" screen is as big as I would go with a phone.
It would be great to see Samsung release a new phone with a 4.7" display. The Iphone SE 2020 has shown that there is still a market for compact phones.
All the best