You'll have lower energy use modes available for battery powered IoT devices.
You'll be able to be in a very dense crowd and have your services still work.
It is also lower latency that 4G, so things like gaming over your 5G connection become more possible.
These may not matter to you, but they are use-cases that 5G allows.
5G has a lot of possibilities both for improved mobile data and for last mile where it either doesn't exist or is some old 1Mbit ADSL line. But I'm not convinced it will generally make sense to ditch good wired broadband just because 5G is available.
Even if you technically could, I expect the economics won't work out, e.g. throttling/caps/overage charges, for people trying to do a lot of data-heavy things like video streaming if they have an alternative.
It is difficult to know now, but I think the probability is very high that we will "need" the bandwidth down the line for something we will find useful.
- that every cellphone user in the world is going to just run out tomorrow and buy a phone that's $200-300 more expensive to replace the phones they have now, have been replacing less and less of in the past half a decade, that they barely utilize to its fullest if the network were just prevalent everywhere today
- that some measurable fraction of the towers spaced every 150ft will not be vandalized, broken and sold for scrap in many places in the world and have to be replaced in order to have the throughput as advertised, that the companies will be just excited to replace, whose total cost will be less or the same as current infrastructure costs
- that despite the junk rating of many of the biggest teleco corps, they are well capitalized with pay for such a network from the ever increasing profits they reap from current consumers and wont have to rely on more junk financing and will take great care of the infrastructure just like all the great care they have put into existing infrastructure. Nothing in the future could ever threaten their solvency
I wish them all the best!