washer

So to ask short are the washers for the motherboard standoffs really necessary? I'm going to remove a motherboard with washers ASUS P7P55D-E that I installed years back and replace it with a ASUS - X99-A/USB 3.1. But I'm still not sure if it's more unsafe if the washers are not there. Help?

So I was a console player back then with using wifi but now I'm a pc gamer , and lots of people suggest me to use an ethernet cable for gaming. So If I use an ethernet cable, would my family's phone connections and my brother's gaming pc connection would be lower and slower? If its true, then I...