It's not a 5G issue, it's a spectrum allocation issue.
I seem to recall this revolved around, questionable tangible benefits vs cost of deployment, poor penetration of 5g signals through structures, a lack of devices or internet plans to take advantage of 5g, and some other things that just seem to have taken a back seat to all the bullshit.
[0] https://www.popularmechanics.com/technology/infrastructure/a...