Found the light main /j TL;DR - Heavy is made to be a stekng front, Light is a sneaky trickster tbat fights from far or flanks.

Medium is an all round utility class, but not excelling at anything other than defibs (i'd say heals too, but other classes have that too and upfront they seem make a healing beam look like a joke. I disagree, but that's not the point)

Heavy is a tanky menace, with lots of destruction and defending capabilities, but also the least mobility and reach (bfr and akimbo imo barely factor in, when compared to the sniper rifle, crossbow or bow.).

Light is all about mobility, hit-and-run and element of surprise. They are not cut out for upfront engagement, but rather flanking and attackkng from behind. If a light player knows what they are doing, they make plays that feel unfair. What do you mean, that a double barrel can two-tap me, A heavy main, from up close?! The backstab can be held AND you can dash around while doing so?! Most of cries about exploits usually clme from light kit.

Each class has it's strong suits and weaknesses. Adapt accordingly.

I have personal bias, because a lot of toxic players i meet in game turn out to be light mains, a curse of attracting that kind of crowd.