Yes, we do. Huge Power and Pure Power are strict improvements to Gorilla Tactics. They are not inherently broken, therefore Gorilla Tactics cannot, by itself, be broken.Gorilla Tactics exists on Darmanitan and on it alone. You can not say the ability is or is not broken because you have no second reference point such as with Protean, Speed Boost or Shadow Tag/Arena Trap.
No, it's really not worth noting. A metagame where you can put any ability on any Pokemon is inevitably going to have a different sense of balance than one where you, like, can't do that. Hackmons has literally no bearing on official tiers whatsoever, this argument is frankly absurd.It's also worth noting that Gorilla Tactics has been quickbanned in Hackmons. Hackmons isn't precedent in OU, clearly. But there's a potential argument to be made that it and Huge Power (and Wonder Guard) are in fact broken abilities, and Gorilla Tactics is the only one that has failed to positively affirm that bad distribution balances it.
Anyways I've said all I have to say regarding this issue so I probably won't be replying to any more posts unless they actually bring up something unique. This horse is dead, no point beating it any further.