It is not my video but exspecially in the second half he holds the point for a very long time in siege mode. And it isn't even so much the damage reduction but rather the passiv repair that makes i viable. Imo if they polish it for that role for all heavies then it can be quite viable and fun. Things I would change/improve on:
- passiv heal being a basic mechanic no matter which heavy (based around 30% - 50% of the repair heal maybe)
- both - transformation and movementspeed - should be a tad higher
- more damage: no heat generation and 20% decreased cooldown on both weapons
So these changes would make the mode definitely fun but it might be toxic for gameplay in general because it pretty much advertises camping/sitiing on a point spamming your stuff. So this is why it needs a clear way to be countered: Close quarter combat.
- damage reduction seperates between explosions and bullets: 70% vs explosions/30% vs bullets
- reduced shooting angle: you can only vertically aim between 45 and -45 degrees. so if someone is flying directly above you for example (90 degrees) you just cannot shoot him. The thing to do would be to attack them from directly above. You can literally stand on them and finish them off.