You make it sound like this is an easy option for everyone, but it's not - your router is likely to be where the phone/fibre socket is, and that's not always going to be where your PC is. If you know what you're doing, you might be able to pull a cable and install a new socket, but that's definitely no lt for everyone.
not everyone is going to have wifi interference either
There is nothing complicated about pulling wire. There are tons of videos on Youtube. People just convince themselves there is all this stuff they can't do - and what do you know! When you don't even try you can't do it.