A very interesting thread, having witnessed many, many over more than a decade o this subject.
In the end, it is down to individual preference and of course listening.
Very interesting about the BT Hub; was it that which turned a “fryer”?
When I first had BT FTTC, I only checked that the correct lights were on, indicating a service, but never connected the ISP box - too limited.
I installed a Draytek modem/router, which is one of those manufacturers who have submitted their units for BT approval. The process can be found with a web search. Renovating more than two decades ago, I had then anticipated ethernet would be required whole house, long before wifi was reliable. I dispensed with the first Netgear wifi and installed Ubiquiti WAPs, now numbering five across two buildings, when PH recounted the issues that PS ex-md, had experienced. Ethernet here wired to all rooms, some with multiple outlets.
It is interesting to note that you Simon have commented that quality wifi is now reliable; I have waited twenty years, so my original installation has been worthwhile. Originally many things then like tv, certainly didn’t have ethernet but it came in due course.
I use Draytek PoE switch for WAPs, Netgear for remainder of ethernet, although I had one fail months out of warranty, so I will change manufacturer next time.
I have followed much of the emerging threads on the topic over more than a decade, including Simon’s interesting and intelligent posts. Two different Ciscos have given way to a EE8, connected to NAS and to ND555 streamer. I use upgraded i/cs and power supplies for both router and dedicated switch. I set a budget, then consider the options.
Swapping, fiddling and auditioning endlessly, isn’t for everyone. I sincerely appreciate those that have taken the time to post and I rarely attempt to change anything, since it all works and sounds excellent.
Good wifi though, as others have said, is a prerequisite. Certain manufacturers do well and others not so. Across two buildings and a mix of legacy and latest streamers, I never get any spinning wheels on the Naim iOS app!