There is misconception that all radiation and all patterns of it is the same. Comparing output power is largely useless because what is really important is how

There is misconception that all radiation and all patterns of it is the same. Comparing output power is largely useless because what is really important is how it affects body and this depends on very many factors, not all doses are the same. For example, standing in full sunlight might not be a problem normally unless you stand for entire day and get burned (extended exposure without allowing the body the time to repair) or maybe the sunlight gets concentrated by a lens and burns your finger without changing total exposure to sun (concentrated in space) or maybe gets somehow converted to UV (concentrated to restrict wavelengths to hit specific molecules reacting with UV) or stored as energy in the form of oil and released quickly when burning (concentrated in time). The first cellphones where much larger devices placing the source of the radiation further away from your body. They were also omnidirectional making sure that the maximum density of the field was low. New devices use beam forming which means it sometimes hits with a dense wave travelling through your body as if it was a sunlight concentrated with a lens. Also, new cellphones are much better transmitters with much better control of the spectrum to maximise the power at a specific frequency. It further exacerbates the effect meaning if the beam interacts with something in the body it interacts much more strongly, again, akin to the concentrating lens. With old cellphone everything would be getting warmer a bit, with newer ones it may come into much stronger interactions because it may do it much more selectively (in space, time and choice of a molecule it interacts with).