Yeah what do you expect to see from it? These wifi apps can show you a lot of stuff.
My more small office grade Mikrotik router has a so called "wifi snooping" mode where it will not only show all the networks around but also the clients connected to them along with how much traffic each one is causing on the network.
Of course that is as much info as one would hope to gain from it since any actual data going across the network is encrypted (Hopefuly is it at least, and with a modern not yet broken standard)
Still this is more than enough information to determine the best frequency band to operate your wifi router on
EDIT: Oh and the reason why those RTL-SDR spit out raw IQ data is simply to save cost on making them. By not having to decode any of it means that they don't need a fast and powerful CPU in there and its easier to stay within the power draw limits for USB ports. Instead they cheat and the dongle simply streams the raw data to the PC where it uses its vastly more powerful PCs CPU to actually decode it into video. WiFi uses much higher bandwiths so this would be impractical, they instead have more purpose designed RF trasciever chips in there where the whole MAC layer is handled (as its normal for a network card)