Postings indicate that you cannot have separate ids and passwords for 2.4 and 5ghz networks when using these. Yet many smart products (myQ, Wemo, LIFX) require a 2.4 ghz network to work. If the XFi modem just auto switches to whatever It thinks should work, how would you be able to register and maintain such smart devices on the network?
The pods do the assignment to the correct band.
"Other than Xfinity Internet and a compatible xFi Gateway, is there anything else that is required to use xFi Pods?
In order to activate and use your Pods, your xFi Gateway must not be in Bridge Mode and your home network must have the following settings enabled:
When you activate your Pods, you may be prompted to make any of the above changes to your settings if they are required.
Once you've activated your Pods, advanced settings like WiFi Mode, Channel and Channel Width will be managed automatically to provide the best coverage."
With merged bands, the xFi Gateway band steering logic will try to connect your device using the 5Ghz band. However, if your device is not within range of the 5Ghz band or is not capable of connecting to it, then the Gateway will present the device with the 2.4Ghz band. Even with a single wifi name and password, your devices will know which band to connect to for optimal speeds
Please let me know if you have any questions,