I lived in a place where they had many co-located LTE base stations and power density about 1/4 mi away from these exceeded 75 mW/m^2. Now, I get it that a typical wifi base station transmits up to 500mW, but that's a point source and the inverse square law works to your advantage - the total dose in any one direction is minimal.
Not so when it's a huge multi-tier tower - that's your whole body facing the tower getting that dose.
I'm a software engineer, a technologist, by trade and I was in complete denial about this until I started getting serious eczema that only went away when I stopped using wireless gadgets and avoided staying too long in areas with cellular base stations.
I denied and denied and denied but repeated experiments on myself only revealed how my body reacts to this stuff. My ideal power density is less than 1mW/m^2 to not break out. And there seems to be a relationship to what LTE bands the tower is transmitting on - outside the US I seem to do better. It could be the frequency, or could be the modulation.
It's an inconvenient possibility (not going to call it truth) that our technology might be hurting us. We're addicted to technology the same way smokers are addicted to nicotine.
Smoking was at one time considered healthy and promoted by doctors, and now where are we?
Unfortunately, as a society I think we're going to have to "pee on the electric fence" for ourselves to find out.
Despite the fact that this spectrum has never been used for any widespread purpose, we're rolling it out and the burden is not on the implementers to prove that it is safe. It's basically on researchers to both prove, publicize, and convince society as a whole that 5G has health impacts.
I am not going to go all conspiracy-theory and say that the research is being suppressed but certainly funding for this research is not going to be a priority for the US government, as they've been thoroughly bought and paid for. Most research into health effects of non-ionizing radiation is not funded from the US government, so draw your own conclusions from that.