Warlocks should be able to CHOOSE their casting stat.

[Joe the Rat]

Re: Multiclassing -
If, at the end of the day, it's always better to multiclass, then you need to revisit your base classes. Ideally, your single-class character should be better at doing what the class is supposed to do than a multiclass build - something we see violated all over the place, in part because there is also the drive to get the core essence of the class into play as quickly as possible. We look for the synnergies, but there needs to be something given up to get them. Mid-high level floof abilities aren't enough of a drive.

(There's also the issue that Warlock is generally perceived as "Eldritch Blast Platform," making it a 2-level sidearm rather than a class, missing the rest of the rules-of-magic-breaking fun).

People have been shoehorning D&D into other genres since before D&D was even D&D.

To be fair, people have been shoehorning other genres into proto-D&D since Blackmoor. I blame Vance.

[Leon]

If you aren’t keeping up with Twitter and current events then it’s kinda hard to keep up with what is “cannon” for lack of a better word. P

What is "cannon" should be Book releases not what a idiot on twitter is posting even if they work on said books

[PhoenixPhyre]

Thinking about this in context of my own headcanon for how warlocks (and spell-casting in general) work, I have to disagree. Warlocks are pretty firmly CHA casters in this context.

Your casting stat is determined by where your power comes from.

INT casters learn their magic, mastering it themselves by conscious thought. It does not come from an outside source at all. They get better at magic by being smarter, which lets them understand and master all the variables themselves.

WIS casters ask for their magic in the moment. They do not master the magic themselves--no part of it comes from within. Instead, they act as channels for some other source. They get better at magic by perceiving the directions sent from their source more clearly and "getting themselves out of the way" more.

CHA casters have magic instilled in them by something. Whether accident of birth/environment (sorcerers), connection with the Words and Harmonies of creation (bards), or by contact with (unwitting or not) some powerful Other, their power is inside them but not understood by them. It's not their design or creation; it's unruly and untamed. They get better at magic by getting better at controlling this magic by force of will. Better at exerting their dominance over the magic. They don't do it by intellectual exercises (INT) or by hearing the words of their patrons better (warlocks are not channeling their patrons by default), they do it by asserting primacy of Self over Other.

Warlocks, in particular, cheat to get their magic. They don't go through the intellectual exercise to develop (or follow) an organized, systematic magical system--if they did, they'd be wizards. Their magic is sparked by their Pact (which might just be incidental exposure). But it doesn't develop naturally. Instead of naturally opening spell slots by meditation, practice, etc., their slots are shallow wounds in their souls torn open by the Patron and enlarged by continued exposure. Their spells aren't learned by rote, they're gifted to the warlock in their full form. Effectively, warlocks have a cheat sheet to the universe that they downloaded. But like all cheat sheets, having it and using it effectively are two different things. They cast by force of will, not by intellectual understanding.

And unlike WIS casters, they don't feel or perceive the magic flowing into them in the moment. They don't channel their patron's power--the power has been granted and can't be taken back. The patron can refuse to give more (cutting off leveling and denying the capstone unless they find a new patron), but they can't stop the flow right now. And can't take back what they've given. While a druid can be cut off by the spirits and a cleric can be rejected[1].

Note: This is all head-canon. I don't claim it's official lore, but it fits what I understand about the official lore fairly well. I believe.

[1] Paladins are CHA because it's their strength-of-will (and conviction) that powers them. They don't channel anybody except their own conviction. Effectively, they're their own "deities". Able to cast spells and do magic because the universe is tired of arguing with such stubborn, elementally convinced beings. This is also why they fall--if they lose confidence and reject the Oath that ties them, they've cut themselves off. Clerics can be un-chosen, paladins have to make themselves fall. No one else can "fall" a paladin. And that's the essence of the CHA/WIS split. CHA casters can't have their power taken from them, although they can reject it. WIS casters are dependent on the Other all the time.