Technology

Bandwidth is the amount of shit the modem can pull down and thereafter divided per client further subject to the limits of the service itself and any chokepoints in the network with data hitting the client no faster than the slowest leg.

As far as wifi 5/6Ghz is fairly fast but good for no more than 100–200 ft inside and oft less depending on material in between and conditions and subject to interference to boot. Most people in multi story dwellings have poor connectivity over 5Ghz upstairs without a second AP on that floor and rely on slower 2.4Ghz and furthermore may have a limit to the connectivity between AP which effects downstream clients.

That is what I meant by the 80MBps if the link between Router and AP is 80Mbps the AP can only provide a maximum of 80Mbps connectivity with the outside world shared between all its clients no matter how strong its connection. This is why I suggested a wire between router and AP. Factually real world clients usually have 20-300Mbps over wifi and need nicer clients AND equipment to provide good service whereas wires provide 1Gbps over cheap as equipment from 10 years ago.

P.S. I worked in support and had a really good solve rate I made money mostly by helping people improve their service in tangible ways that made sense to them. Just because an industry is scummy doesn't mean everyone in it is.