Quickleaf
Legend
You run into the problem of Ability-Score-as-Class.I miss Intelligence, Wisdom, and Charisma having functions outside of their skills and saves (and magic for casters). In 3E, Int gave extra skill points and languages. This kept it from being dumped to the floor, or at least made you feel it if your character idea came with an 8 Int; I know I only considered it for Barbarians, because they got 4 skill points per level so I felt okay losing one.
Wisdom is always painful to dump because Perception is useful for everyone and Wisdom saves are important.
Charisma is always easy to dump because it just has its skills and rare Charisma saves.
So, what could be added to Intelligence and Charisma to make them feel less easy to dump and more beneficial to boost?
What if Intelligence offered extra languages or tool proficiencies? Current characters get 2 languages in 2024. Instead it could be Common +1 language, with additional languages or tools per Int mod. Int could also decrease the time needed to learn new languages or tools (but I haven't seen that rule in the 2024 phb).
Wisdom is probably fine. Perception and Wisdom saves are important for everyone. Passive Perception is like a feature.
Charisma is tougher. In older editions, Charisma had a reaction bonus, or it was used for determining NPC reactions upon meeting them. Charisma could be for Hero Points or Inspiration (charismatic characters in fiction are often lucky or confident). Charisma could be for NPC contacts, showing that you make friends where you go. It could also be for a Reputation/Fame/Infamy feature.
What do you think?
For example, say INT also gives bonus skills/languages/tools, then you have your Wizards and Artifcers becoming skill monkeys automatically.
Or if you say CHA also gives you a number of Contacts, then you have Bards, Warlocks, and Sorcerers automatically being well connected.
And for some character concepts, that is totally OK... but if you want to play a bookish Wizard, default 5e will have you run out of lore skills to pick.... or if you want to play a Sorcerer who just left the family farm after their magic went wild and doesn't know much of the world...
So yes you can implement those changes (I did a similar house rule or INT in my game), but the question is can you live with the outcomes?