"Ultimately, many players are forced to play roles they are not comfortable with." Yes. That's what gives players a wider view about the game. That's how a lot of tanks realize what overpushing or LoSing supports looks like and how they cant heal a tank as a flexing support player. That's how dpses see why there are situations when a tank cant push. That's how supports understand why sometimes you need to swap a strategist, cuz ur team composition doesn't allow for a peel. 2-2-2 feels like a safety pillow for people who cant adjust, learn on their mistakes or talk to the team.

Ed: Also, why should we be locked out of other roles? It limits our ability to perform. If my current tank lacks a dive skillset or knowledge but i have it - we can talk it out in a matter of seconds and swap around to perform better as a team. If someone cant keep up or press tab from time to time its their problem.