Gizmodo has a very detailed analysis of cellular "unlimited" plans that is a great example of why wireless broadband is never going to be a complete substitute for fiber service.
The carriers would not carry out this wordsmithed subterfuge if they did not have to, but the problem is very simple. We all keep using more bandwidth, and the bandwidth available from free space wireless in any given frequency range (e.g. 3G, 4G, 5G, LTE, etc.) is strictly limited by physics.
Fiber, on the other hand, can have its capacity upgraded easily without having to replace it.
Hat tip to Eldo Telecom.