As a follow up to this question: What are the impacts of allowing Rangers to cast Arcane spells?
If we assume that my DM is fine with letting the Ranger use the Wizard spell list instead of the Ranger spell list (since that's what the other question is about; let's also assume that our party's Wizard is cool with it), then I think it would also make sense that the spellcasting ability should be INT, not WIS. WIS is typically associated with Clerics and Druids for casting divine spells (which includes druidic spells, at least I think that was the case in 3.5e anyway), not arcane spells.
Also, I personally think that, even if we gave the Ranger a different arcane spell list like the Warlock or Sorcerer spell list (since the Wizard spell list was picked arbitrarily as an "arcane" spell list), it still wouldn't be something the Ranger would control through force of willpower (which is what CHA represents for Warlocks and Sorcerers), but rather something they would learn via INT (similar to Eldritch Knights and Arcane Tricksters). Anyway, that's enough of my opinions... on to the question.
If I wanted to change the spellcasting ability of the Ranger from WIS to INT, what are the impacts of making this change? Is spellcasting the only (mechanical) reason why a Ranger would care about having a high WIS, or are there any other unintended side effects of making WIS less important for a Ranger?
Here are some reasons I can think of that the Ranger might care about WIS besides spellcasting:
- Foe Slayer, the Ranger's capstone ability, uses your WIS modifier (though I doubt this campaign will see us to level 20);
- Most of the skill proficiencies available for that class are WIS skills (Animal Handling, Insight, Perception, Survival) vs. INT (Investigation, Nature);
- A Gloom Stalker's Dread Ambusher class feature uses WIS (XGtE, pg. 42);*
- A Monster Hunter's Hunter's Sense class features uses WIS (XGtE, pg. 43);*
However, none of these seem like a huge deal to me, since I wouldn't want Animal Handling or even Survival for a non-nature-y Ranger (I would rather him have Arcana, for example). Is there anything else I'm overlooking that might actually affect my character concept (from a mechanical perspective)?
[*] Note that I'm interested in making a Horizon Walker, so these don't concern me for my current character concept.