Only difference I note is in WiFi I am in a house where my AirPort Extreme (yeah still using mine and have a backup one as well LOL) is in my back office and when in kitchen with laundry/furnace room between me and my AirPort Extreme my 5Ghz signal is cut significantly. I am on ipad now and it shows one to two bans of Wifi on this 5 GHz band. Occasional times it is too weak and I have to go to the 2.4 GHz band that is stronger. Had to do same with iPhones through the 14 PM but with my 15 PM the 5Ghz is too weak most of time for things like mail to check and such and I have to put the phone on 2.4 GHz for it to work in kitchen when I am in line of site down hall sitting in living room I get full strength — my furnace metal is blocking and probably water heater also.
This can be fixed, for not a lot of money -- with greatly improved reception. First, you need a new router. The AirPort Extreme is so badly outdated at this point, you lack the radios and bands necessary for good wifi. You literally cannot take advantage of the new radios/modems in your iPhone and other equipment (which you paid for).
Upgrade it with a TP-Link router, the
AXE5400 is a good 6E router. Or you could go absolute full beast mode with the
AXE16000, but probably massive overkill. With this upgrade alone, you're going to see
much better performance.
Now, after that upgrade, if you still see issues in, say, a back office, use Ethernet over Powerline adapters. They are amazing if you have reasonably modern copper wiring in your home. We use an ethernet plug-in version for Apple TV 4K streaming, and a wifi version on a third floor (the TP-Link router is on the bottom floor). We use a prior model of these
Gigabit Adapters. The benefit of using the Powerline adapters is, if you are far away from the router, you can simply go into your wifi connections and specifically connect to the adapter. We find this much better than the mesh systems, which can bounce you to remote nodes you don't want.
And the ethernet / plug-in Powerline Adapters are killer -- superfast speeds, very low latency. If you can run ethernet to your device they blow any wifi out of the water. Truly gamechanging for streaming and desktops located remotely away from ethernet ports.