A year late but oh well. Was watching it again tonight and wanted to see if anyone else had the same thoughts.
While watching the movie several times the same issue bugged me a little. I agree with oversimplification 100%, but also expanded on it in my own head.
My rationalization was that the “unexplained to the layman” technology of the suit would control mass/density dynamically based on intent, or under user control (user control would be risky, you could kill a bunch of the flying ants if you forget). With the theoretical complexity of the technology proposed, there would be a TRUCK LOAD of variables that should be available for manipulation.
If we assume the suit uses a computer interface to aid in Ant Man’s shrink/grow abilities it could also use some sort of “fuzzy logic” to determine when and how to apply his full mass/density. Maybe based on the force of his muscles, or some other biofeedback that wasn’t part of the “training montage”… seriously, they can’t fit ALL the training in those things… movie would be too long and boring.
The only issue with my theory is the effect on the wearer of the suit. Going from “size normal” to “compressed” density would affect your ability to walk and move. It would also have other effects such as loss of body heat. Of course there could be other technologies in the suite to address those such as insulation for hypothermia and maybe “stiffening” of the suit to compensate for changes in mass/density.
My goodness, you could probably use existing “real” science to list and address issues within a reasonable range to cover most of the fantasy tech. Reminds me of Larry Niven’s essays on this type of thing. He used real science to explain how Superman might have a child with Lois (well, uh… how he could have “relations” with Lois as Superman, and problems he probably had during puberty), or how teleportation tech could be used for inertia-less drives.