: When would a strong no-no guideline become insignificant? For example, when choosing a pair of typefaces to combine in a single line, it is advised that: they are from different categories,

For example, when choosing a pair of typefaces to combine in a single line, it is advised that:

they are from different categories, in order to make them contrast
they should have the same x-heights, in order to make them smoothly reading

(How to know which second typeface should be used, given a contextual typeface?)

I wonder, what if the difference in x-height would be visible enough to make it contrast, yet the smoothly reading requirement is still satisfied? Therefore, even if the pair come from the same category and it's a no-no, it would become insignificant or even unaffected to the viewer's eyes?

In general, would there be a case in typography that one aspect is strong enough that it can suppress a no-no in other aspect, so that there is an exception of the no-no? I think it's similar to psychology, when you find some thing so unacceptable at the first sign, but latter with time you get familiar with it.

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