At least to force selection of 2.4 when both bands are offered by a WiFi router. Ideally, the customer would be able to choose the band that best suits his/her needs. I don't doubt the capabilities of your technical team; however, should they need a contact to help them with this enhancement, let me know and I would be glad to put them in touch with people I know who can help.
As you likely know, the issue arises where a router defaults to offering both bands. When I installed my unit, it was at a home I own, but rent. The tenant has their own router. They were kind enough to grant me access. When I learned that I could not connect, I was loathe to ask them to either set up on their own a separate instance utilizing 2.4 only on their router to serve my purpose.
My solution was to buy a wireless hotspot from my wireless carrier. It seems to me that Rachio should endeavor to further enhance the already obvious value proposition by making the installation and set up very, very easy. A symptom of level of difficulty is evident when a Rachio support rep is instructed to ask first if the customert, who may know nothing about WiFi bands or router set up, is "are you operating on 2.4 only?" Making the symptom worse is to have to tell a client that support cannot help unless they can verify that they are ONLY on 2.4. This has the tendency to turn a very useful technology into a boat anchor.
At the risk of being pedantic on this, I would venture to guess that if you looked at the root cause of calls to support and returns, a high ranking cause must be this issue. Sorry about my fervor on this, it's just that I have worked in tech businesses for so long that I know there is a solution to this that is well within the capabilities of a company that created such a great product to begin with.