Has anyone else noticed their iPhone 5S to have trouble finding and connecting to 5GHz 802.11n wireless networks?
It doesn't support 5 GHz.
Yes, it does. I haven't had any issues joining my 5ghz network at home.
Don't forget that the 5ghz band has weaker wall penetration than 2.4ghz. In can use 5hz in the house but to reach the garden I have to hook onto the 2.4ghz.
At the risk of beating a dead horse: Don't believe everything you read on the Web.