On Tuesday, 11 August 2020 09:45:07 UTC+1, No Name wrote:

Another use case is VPN'ing back to home from a mobile phone over 4g and
soon 5g instead of using a public wifi network. Fibre tends to be
symmetric whereas for ADSL/VDSL/Cable the DL speed is higher that teh UL
speed.

The kind of fibre service that BT are offering is unfortunately not at all
symmetric. The uplink is time division multiplexed in the same sort of way
that cable services operate.

John