There are two problems - coverage (trees, other houses ect get in the way) which means that for some places it's fine, for other places no good, and contention.

There are two problems - coverage (trees, other houses ect get in the way) which means that for some places it's fine, for other places no good, and contention. In 5G the bearer (radio frequencies) is very well managed and I am 50/50 thinking that realistically contention will be ok for large scale consumption. But... ultimately, you have one set of radio between everyone whereas everyone has a fibre... (this is not quite true due to GPON but sorta!)