I have now had BT Infinity 2 for a few years and I have never used the BT supplied modem/router equipment for longer than a few weeks as I have never thought much of the equipment BT distribute.
Originally BT supplied me with a Home-hub 3 and the Huawei Modem, (with equipment, PSU's and wires everywhere), and I soon changed that for a Fritzbox 7390 which simply and neatly plugged straight into the BT master-socket and is a much better router.
When BT introduced the Home-hub 5, (I obtained one of those as it was much cheaper than the Fritzbox and had a 5ghz wireless option) but the general performance of the BT Home-hub 5 was inferior to the Fritzbox and I now just keep the BT Home-hub 5 in case of a line fault.
Since we first had BT Infinity installed we have moved house and I found that the BT Infinity/open-reach engineers did not care what router/modem combination that you use as long as you know how to set it up yourself but if you do get a fault on your BT line and you need to contact the BT India based call centre the BT call centre staff will insist on you plugging in a BT router while they carry out their line tests and that is why I keep a BT router to hand.
You can if you wish to just set the BT equipment up and put it away in a cupboard in case you need it when/if there is a fault on your line and in between times you can set up and use a router of your choice while the line is OK.