
Mythic Evil Lincoln |

For 25, +0.
For 30, maybe +1.
It's not that it doesn't affect things, it does. Certainly more for multiple-ability characters than for single-ability characters.
But unless you have enough points to really raise the ability scores higher than 18, or to have multiple 18s, an individual encounter should play out more or less the same.

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Against parties of a higher point-buy value, I'd probably be more inclined to present more numerous monsters of the appropriate CR rather than higher-CR monsters. Just a gut feeling. For instance, a pair of CR 3 critters are supposedly a "standard" encounter for a 5th-level party; I'd probably drop three CR 3 monsters rather than two CR 4 ones.