Do all widget areas need to work correctly in all widgetized areas? No exceptions?

As per the documentation, “the default WordPress widgets should work correctly in all widgetized areas”.
I wonder if the same rule applies for Theme Forest. I read all the Theme Forest’s documentation for WordPress themes, but I still have doubts.
For example, I want to upload a theme that has a top widget area. The initial idea is to feature a search widget on the left side and, say, a social icons and a text widget on the right side. I think my theme user won’t need to add a calendar widget or a tag cloud widget to that top widget area…
So, do I still need to make all of the default WordPress widgets look correct in that specific sidebar?

It does apply for ThemeForest as well. No exceptions