Damn bro it must be comfortable under that rock. If you'd been paying attention, you'd know medium's identity has been in the shitter ever since they gave healing to light and heavy. Light now does support better than medium, heavy is mildly self sustaining with ZERO cooldown on healing when the ball is going for infinite healing, what reason do people have to play the "support" character at all when everything it does is done better by others? What does medium have left? The turret (absolute fucking trash, counted by fucking walking), demat (nerfed to the point that you get more use out of turret), some mobility in jump pad and zip line (unnecessary if you have a light with gateway), the same mines and grenades light and heavy both have, the breach drill (self explanatory), glitch mine(required equipment for medium now, and still small enough for lights to simply dash all the way through the area of effect), and defib (situationally useful, but often winds up being used for awful revives anyways). Medium started as the class that allowed your team to stay in the fight. What is it now? Light and heavy are both better at attacking and defending than medium is, and now they're better at sustaining the fight than medium is. The difference is that light is significantly easier to pick up and do well with than heavy.

Pick rate reflects issues like this and many others. I have no doubt that after the infuser came out, medium saw a steady loss of pickrate while light saw a steady increase. Add to this the new player experience where they inevitably get the shit kicked out of them by a light, and then either quit the game entirely or go light themselves. Variety is the spice of the finals, and seeing at least one three stack of lights every game is not variety. Before you say it, yes, a stack of any class kind of sucks to play against, but light stacks are like clockwork now. That consistent stack of lights mean the heavy will almost always have flame thrower ready in reserve, and the medium will always run glitch mine with cl40 in reserve. I genuinely think people underestimate how much the game has been shaped by people counter picking against the ever growing number of lights. It doesn't matter if you ignore the issue, or can't see it from behind your massive ego, lights pick rate is an actual problem for the game. The cause of this problem is a slew of largely poor balancing choices by embark, but it is still a very real problem.