LogFAQs > #952474963

At low levels, a difference of 10 is significant. At 80 vs 90, that difference is comparatively tiny. Literally an eighth of what it would be at 10 vs 20. I mean, if you want to split hairs, then yes, there are small things like this that matter. You also will have ~15 extra ATK, plus whatever you get directly from the ascension. And for anemo characters, it might affect your lift, such as with jean's E or venti's Q.

But I feel comfortable stating fairly decisively that the primary reason to ascend past 70 is to raise talents past 6. That by itself is at least half the value. And that's from seventy. (The free fate notwithstanding.)

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Only the exceptions can be exceptional.