i think i can invalidate half your arguments with a quote of myself.
If the hook needs a comparable skillset i would be ok with it.
For the other part and how to counter it, its hard to say this without appearing disrespectful, but i think i know what im doing ingame. So i would be doing fine no matter what. But its not about me, its about the general balancing and gameplay.
As i said, Halo is a shooter, not a melee game. I see no reason to expand the arsenal of melee combat any further.
What would be the benefit? Its hard enough to balance all weapons besides the spawnsystem, power ups, ordonance drops, possible armour&weapon customization and whatever new mechanic might come into the game.
I believe the game would benefit more from a focus on the basics.
Everything else has to be integrated very carefully. And since Halo 3 nearly every new mechanic was discussed very polarized.
A hook could be fine if handled with caution but could also be very harmful if too powerful.
On another note its not even about how i like the gameplay, but how halos fanbase does.
Its not 2004 anymore, there is a lot more competition on the market.
And if halo gets more CoD or whatever, it means it loses its unique selling point.
With production and marketing costs in the multi millions, there has to be a focus on the biggest buyers group out there.
And thats old school halo fans. You dont have to spend marketing dollars on them. They see a new halo, they buy it.
IF its a halo they expect. If its too fast, too slow, too different, they might switch to another game.
For the campaign its a bit different, thats traditionally a casual thing. But multiplayer is a coreplayer genre.
And if they in any way consider it to be an eSports title, there must be a wide skillgap.
Something that not broken, too random or what makes other weapons/skills redundant.
And i would bet, thats not the hook.