Turn off WiFi on T-Mobile Home Gateway

I am absolutely livid with this tmo taking away a CRITICAL feature that had been part of the service for quite some time.
I absolutely have to be able to use my mesh system to reach the edges of my property. The wifi in any single router or node has no chance. The wifi in this router is not very good to begin with. 

I spent a week looking through video reviews of this and EVERY SINGLE one pointed out that A) the wifi in the routers as provided is pretty poor (which it is), and B ) no problem you can turn it off and use your already existing far better wifi and mesh systems. 

So I guess this will be going back. I'm not sure why T-Mobile would want to mess with success and make liars out of all the youtubers that evangelized this system for them.