Your ignorance of its benefits doesn't mean it has none.
You can literally google "5g benefits" and read through any number of whitepapers.
For one, it has much lower latency, making it competitive with fibre in many areas.
It's more efficient, allowing more devices in the same area. The 60GHz band in particular will allow extreme densities as seen in sports stadiums or major train stations in rush hour.
It has higher peak bandwidth.
It includes special modes optimised for very lower power devices with modest bandwidth requirements.
Etc...