Is it? I guess in US with its vast land mass and relatively low population density wired is very important, but I can tell you in many parts of Europe LTE and up are slowly becoming the norm even for high-volume, high-bandwidth usage such as for video streaming (not at 4k though ofc).
But surely most houses near cities in Europe has at least the option to get a fiber connection these days? Given the choice between LTE and fiber, I will choose fiber every day because otherwise you are basically competing with the radio spectrum and users thereof.
I don't know. My manager (household of 3) just switched to using Verizon 5G for their home internet. She's getting like pretty good speeds compared to what Xfinity offers (which was the only alternative).
The AND in "broadband and LTE" part of the title is a huge hint that the and part is _not_ LTE (non-mobile) data.