Apple’s EFI embeds an older version of wpa supplicant, possibly you are trying to connect to a network with a newer encryption standard like WPA3. I don’t that’s too unreasonable for a 15 year old computer
> Why is Safari allowed to send me notifications begging the user to boot it up and try the new features?
For what it's worth I've been using macOS (and OS X) for 14 years, and you only get the notification once after a fresh install and you can click close and it's gone forever, sure Linux is better on this front, but I don't want to spend my whole life tinkering my os until it works. It's still a hell of a lot better than Microsoft consistently shoving Edge down your throat.