>mmWave really shines in crowed areas like the fairground
Well it really doesn't. mmWave requires line of sight, get blocked by even a pcs of paper or your hand ( if you are actually blocking the antenna ).
It works in shopping centre in some cases, but that is only assuming shopping centre are actually willing to pay and built those out. Every additional cell, big or small requires additional maintenance and that is part of the reason why SmallCell in 4G never really took off. Its idea is nice ,implementation being ironed thought out in 4G and now even in 5G. But never really worked due to the business incentives. ( LTE-LAA or NR-U is a different story )
That is why, no Carrier in Asia and Europe actually plan to have mmWave for mobile. You may read some report on mmWave from certain countries, but all of them are for fixed wireless Internet. No carriers, in any of the industry forum or investor notes has actually put out a timeline for mmWave. EU put out mmWave Spectrum for auction and no one was interested.
So unless there are something specific to Verizon, may be it owns more property in US where mmWave unit economics woks out better for them, or something I oversee. I dont understand why they ran with it. ( Other than some mentioned, being able to charge additional $10/m for some small benefits )