y tho
What problem are you solving, everyone goes for medium tanks anyways.
Not in larger game modes where behemoths with high armor/hp render medium tanks unimpressive. This is why teamgame meta is TD spam and panther spam. Flanking is not always possible due to terrain or player density, so this change would actually benefit some frontal engagements with medium tanks if you're willing to risk closing the distance. It's not like mediums will become OP or anything, but at least they might be a bit more useful in some situations.
Good example is the Lienne Forest. Panther is dominant in the forest part of the map as TDs can't use their range advantage there. AT guns are pretty bad to use in locations with bunch of sight blockers too. Mediums just don't cut it there.
There are a few problematic locations on several maps for 2v2+. It's not a big problem, but the idea of vehicle point blank addresses it quite well in my opinion.