No.
Should panthers be limited to one too?
remember that time when a swarms of panthers came up, WPd your AT guns then grenaded your mgs so their grens could move up while they dominated all your armour, bouncing shots left and right because of their hight armour value and pen? yea me neither because panthers are good at shooting an not at supporting.
if the comet was limited to 1 it could arguably go back to closer to its original state because the comet wants to be the best generalist medium combing raw stats and utility. as long as its capable of being massed it will remain underwhelming because the INSTANT its cost effective thats all you will see, just like last time.
limiting powerful tanks has done nothing but good both for the units and balance because swarms of powerful units in cancer, one needs to either make them not worth swarming or not capable.