It does. You can see what the TV is connected to under Devices, look at the TV icon an it will say what it's connected too.
I have SC off, and I am unable to find "Devices" anywhere. For example, when I click on the Pencil icon next to one of my phones, it gives me the IP address and nothing else. Am I missing something?
Also, here is more logic to consider:
If SC is ON, and everything is set to AUTO and for some reason the "Smart" technology of DIR-890L puts my TV on 2.4Ghz, instead of 5Ghz, and additionally on the "wrong" channel -- why then when I manually split the router into 3 different bands (2.4, 5 & 5) (by turning SC off), and each of them are still set to AUTO and none of them are having issues (so far). All I have done is limited my smartphones / laptop / WiFi printer to the 2.4Ghz and told my TV's to use the 5Ghz bandwidth.
I would think that if there is something physically wrong with my 2.4GHz channel, it would had shown up by now (running for 54 hours with no problems).
Another two cents worth from me...