I am more concerned about the erosion of privacy and surveillance state in general than the radio frequencies.
As we get farther along we now see you can stand on a street corner and just say the word "Lyft" and a robot car will show up. They will already know where you are by GPS and facial recognition will know who to pick up. All you have to say is "Lakeside Mall, hair salon" and it will take you to the door. You won't have to wave your phone or anything because they already know who you are and how much you owe. They can build a pattern of travel for your whole day second by second. You won't be able to run or hide, or conceal what you are doing. They will know who you associate with and what they talked to you about. In the movies they call it "Big Brother".
When we fall into this trap of our own making, the Marxist, socialists, will have complete control over everyone. Once out, there is no putting the toothpaste back in the tube. We might think we can regulate what the government can listen to, but we already know that's a lie even today.
They will sell it to you as "modern convenience", but it will never be controlled. The reason We are mad a China right now is we already know they will have a "phone home" feature in every 5G chip from China. Do you believe the USA won't do the same?
I see bad juju coming from 5G just because of human nature. The ability to have hundreds of millions of "appliances" connected to the network will allow almost any thought of the most evil people to come alive.
Oh, and what about hackers?