The radio is the most trivial part possible in fact computers with cellular radios have been a thing for a very long time.
The little micro cell tower alternative arrangement exists to support devices that expect to communicate with a cell tower where cell service is poor. You normally actually plug them into your wired router so they are actually for areas where relying on wireless would be the worst possible experience.
Fiber is able to provide Gbps to for example all homes in a square mile where they each get Gbps and can indeed fairly heavily use it. Cellular internet isn't actually wireless you run fiber to the towers and then everyone in that square mile.
Urban areas where 80% of people live have a high density so for example in New York City that 1 sq mile contains 27000 people.
The little micro cell tower alternative arrangement exists to support devices that expect to communicate with a cell tower where cell service is poor. You normally actually plug them into your wired router so they are actually for areas where relying on wireless would be the worst possible experience.
Fiber is able to provide Gbps to for example all homes in a square mile where they each get Gbps and can indeed fairly heavily use it. Cellular internet isn't actually wireless you run fiber to the towers and then everyone in that square mile.
Urban areas where 80% of people live have a high density so for example in New York City that 1 sq mile contains 27000 people.