Some Warlocks research the location of buried tombs, uncover ancient secrets within them, carefully decipher the meaning of those secrets, risk going mad understanding the knowledge they have unlocked, and only then begin the process of making a pact. And that pact? It doesn't have to be persuasive or even social. It can be a well constructed devil contract, a carefully researched binding to an ancient ghost/vampire/lich, the secret how to release a grateful genie, accepting twisted knowledge and really grokking its meaning, etc.Warlocks are not using intelligence. They're explicitly not; they bargain for their power. They are exerting their will, whether in concert or contravention with their patron. They, like Sorcerers, are "cheating" to get magic, not by studying it (Wizard/Artificer), not by achieving transcendental understanding of it (Cleric/Druid), but by benefitting from supernatural nepotism. "Do you know who my [sugar]daddy is?"
Some patrons certainly do lend themselves more to one stat over another - I think it's hard to justify an Archfey or Hexblade taking an interest in an Int Warlock, while a Fiend, GOO, or Undead might respect Int Warlocks quite a bit (or not care in the case of GOO, and you get as much power as you can comprehend). Even the description of the Warlock itself seems to lean on the idea of knowledge over bargains (though both are valid):
"Warlocks quest for knowledge that lies hidden in the fabric of the multiverse. They often begin their search for magical power by delving into tomes of forbidden lore, dabbling in invocations meant to attract the power of extraplanar beings, or seeking places of power where the influence of these things can be felt. [...] Warlocks piece together arcane secrets to bolster their own power." And later "You have unearthed Eldritch Invocations, pieces of forbidden knowledge that imbue you with an abiding magical ability or other lessons."
The word bargain doesn't even appear until you get to the Archfey or Fiend pacts. And in the end it's just fluff. You can come up with perfectly valid reasons for why either words.
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