No. Cables don’t have internal circadian rhythms telling them what time of day it is

What

Perhaps they are trying to use a wpa2 password on a wpa3 network

Honestly it would save you a lot of time by just renaming the network and reconnecting the devices, you would be done by now

As long as your access point isn’t also a dhcp server you shouldn’t have to do any of that

1.2 or 2.1 should both work. If you use 1.2 make sure your router isn’t starting the address pool that low

What ip are your devices getting from dhcp

Downloads won’t be rough at 500mbps

You could theoretically download a 25gb 4k bluray movie in 7 minutes , then it would take 90 minutes to watch it

Unlikely going to a gig would be any faster as you’d need a server capable of more

I am a tech guy who lives alone and I pay for 35 for 200. Gig is available but it just wouldn’t make any difference beyond occasionally downloading a brand new 100gb video game. But I don’t do that often so an extra ten minutes is rather meaningless

It depends on the device

Usually green means 1000mbps and orange means slower. But that’s not a guarantee and won’t be true on 100mb devices, where it’s likely to be 100 and 10

If you don’t have line of sight forget about it. Trying to run a ptp in a city with NLOS is going to be garbage

No. One vlan per port

It’s digital video so it’s not going to become blurry