The simple fact is, given the limitations of 5G, telecommunications companies and carriers will have to build and install hundreds, if not thousands or millions, of little 5G nodes around every city in order to cover the whole area. And that's going to take a ton of money, and a whole lot of time — likely years.
Brownlee compared 5G to folding smartphones in 2019: "Clearly not ready yet, but when you use it, and you get just the right use case and you're at just the right space, you get this amazing little glimpse into the future that you wish was ready for right now because it's so great. But it's not. Currently, the cons outweigh the pros."