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unfortunately you need to run cables to the access points. Wifi for large numbers is not the same as just plonking a single access point next to your phone/cable socket.
You still have to run wires for Wi-Fi for poe Ethernet to connect the AP's to the Ethernet network - in the case you cant put the wires in the ceiling or floor the you will have to add trunking. Using trunking might be better less chance of finding asbestos in the roof spaces as a mate of mine found in one of our local schools.
wifi for a large population say 600+ for a high school is going to be far more costly than a structured cabling roll out which is only $25/30$ per port
on-board tends to have problems with noise - a problem that an external shielded sound card massively reduces also pro or semi pro cards have better zero latency drivers.
well take that argument to its logical conclusion TCP/IP would have died in a ditch and we would all be using OSI and you subs would take what the PTT allowed you to have.
back in early 95 for BT I looked at the first version of php and described it as a language for COBOL programmers (BT had/has lots of COBOL programmers) who couldn't hack Perl