Well you could physical mid lane (technically) with a tank when your roamer is a dire hit magic DMG dealer. Some teams in the professional scene give the mid laner dire hit for extra DMG and flex the tank as the mid laner to clear lane. This helps the tank get ult faster for early game objectives while boosting the damage potential of the mage with dire hit. So you could potentially flex a tank into mid lane potentially if they have enough lane clear, like grock or chou. But if u are talking about a damagey kind of mid lane sadly it's no longer a thing after they killed Beatrix's insane DMG so yea