What is more repetitive is when any of us posts on the OP's original question.
The answers have basically been provided and acknowledged. The OP is well aware, or should be, that extra speed would not provide any benefits beyond the fact that newer kit may be less prone to failure and maybe a miniscule reduction in electricity usage.
The Ferrari v Mini analogy is clearly completely irrelevant as there are several tangible advantages to each over the other, and likewise disadvantages. Particularly wrt to daily costs, where the Ferrari could well cost as much per day to keep on the road as a Mini does for a year. For instance tyres costing hundreds of pounds
each and it being illegal to repair them if they get a puncture. Never mind road tax, insurance and E5 petrol swallowing. Routine servicing in four figures, not necessarily starting with a "1".
More prosaically and with a slight connection to the OP's kit, I have been entirely dependent on Three since the start of 2019. No landline. Until about a year ago the maximum the router could receive was 4G, but that sufficed to drive my cloud-based security cameras, smart TV, laptop and iPad, plus my Android phone if I decide to save battery when at home.
Then a 5G mast was installed quite a way away. Unreliable in the summer but since the trees lost their leaves almost constant 5G with a few hundred Mbps downstream. Completely unnecessary for me, but I went for it so needed a router upgrade as the existing one was 4G. Just "satisfying" to have.
Connections: OnePlus 8 Pro on Three 4+ (LTE)/5G and at home Three Mobile, with (Three)ZTE MF286D router giving about 113/20Mbps.