Is Hex worth it at high levels?

[GeneralVryth]

It really isn't. The rules do what they say they do.

Yes it is. But we can back and fort on that until the end of time, and neither of us likely has that mcuh.

The Help action calls out that the DM has to decide if help can be meaningfully given, and the player has to describe what his PC is doing to provide the help.

No where in the Help does it say that a DM decides if help can be meaningfully given. Here is the action:
Help
You can lend your aid to another creature in the completion of a task. When you take the Help action, the creature you aid gains advantage on the next ability check it makes to perform the task you are helping with, provided that it makes the check before the start of your next turn.
Alternatively, you can aid a friendly creature in attacking a creature within 5 feet of you. You feint, distract the target, or in some other way team up to make your ally’s attack more effective. If your ally attacks the target before your next turn, the first attack roll is made with advantage.

There is nothing about DM judgement in there at all. Now of course I think DM judgement is given/required but it's not stated.

At no point does call lightning nor hex make any comments about what the PC must do to enact the action.

That is what I have been saying this entire time. The spells don't clarify what if anything is involved in the recast actions. There is no general rule at all either (that I am aware of). So we are left with a DM making a ruling on what those actions entail. And the most logical ruling from my perspective is they entail more or less the same things as the original spell cast because they generate more or less the same effect.

You may as well declare that, because it doesn't specify what the action looks like, a sorcerer applying metamagic must shout the name of the metamagic at the top of his lungs to use it. Which has fascinating implications for Subtle Spell, but Subtle Spell doesn't say it removes the need to do whatever you have to do to apply metamagic. And, since metamagic doesn't say it doesn't require any additional behaviors to apply it, well, obviously it is expected that the DM will rule on this ambiguous situation to add an obvious tell to use of metamagic.

Metamagic is easy, it's not an action. It's a modification on an action. So you can default to the requirements of the action in question (in this case spell casting components since you're casting a spell), unless of course those requirements are modified, by something like Subtle Spell.

Nowhere does it say that a wild shaped druid can "perform the words and gestures necessary" to engage the subsequent rounds of call lightning, as it would have to to enable that spell to have its actions used while wild shaped unless the only action required is the act of will to direct it.

Nowhere does the spell say you must say anything nor gesture to redirect a hex to a new target.

No where does it say those things are actions without any actual "action" either. As for why it doesn't say, it's probably because it wasn't really thought about in the writing of the book. It wouldn't be the first thing that is unclear or inconsistent.

Binding the hands and arms of a warlock and tossing him gagged into the water will not prevent him from redirecting the hex if he chooses to (unless it breaks his concentration). If it even left leeway for a ruling that you have to speak and gesture and maybe provide powdered newt again, then this would be a consideration. But it isn't, because the spell doesn't say it is.

It doesn't say anything though. Which makes your statement on binding the hands either an assumption or a ruling.