I think having an intelligence of 8 means you are of average intelligence - your everyday human on Earth today. Most humans would have an intelligence score of 8-10. A Wizard with an intelligence of 16-18 is basically considered a genius. Scores above 20 are something that Ancient Dragons, powerful Celestials and Fiends have.
I think your character can be played normally with an intelligence score of 8. If it would go below that to say, 6, due to a feeblemind spell, then maybe you can act talk like the cartoon Dinobots ("Me Grimlock smash!") and not know basic facts.
An intelligence of 4-5 is though, barely above those of semi-intelligent beasts. Primitive creatures who only exist to feed and other base needs are like that. For example, a Ghoul could be capable of basic cunning but would be purely motivated by hunger. If your character ever gets their intelligence reduced to that level, they would go basically feral - like a child who was raised by wolves in the wild.
This depends on the meaning you assign to the distribution of stats, something that is very difficult to make sense of. 3-18 is one set of results from creating a character. We've been told that the character creating process isn't representative of "regular people" but only of heroes. All humans commoners, thugs, acolytes... have INT 10. That's a wide array of individual differences lumped into a single point range. It works also for any ability. So every is STR 10, from a man working in a rice field all day and a woman serving tea at the samurai's house alike: the difference between them isn't wide enough to warrant a single point of difference. Then you've the PCs, with tremendous capability to differ from the norm. Even being INT 14 may be supergenious level, for what we know: the difference with humans is as wide as the difference between average humans and an ape. Yet for some reason, a STR 14 human isn't able to break a temples' pillar and kill thousands of Phillistines inside ; I blame a bia against martial classes. The X% better than stat 10 only applies when a roll is needed, which is determined narratively and not with a simulationist intent : if a INT 10 character tried to solve a jigsaw puzzle quicker than an ape, I wouldn't ask for a roll [tbh I have no idea of a real ape jigsaw puzzle solving ability, one can replace that species with a dog if needed].
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