Hello @Kulani, The category description can be useful for SEO for that category page. But when we talk of Ask page then that page is not affected by any category description.
Description only loads there for a short amount of time (only till the user has not submitted the question), after that there is no description so SEO doesn't get affected at all.
You can use that widget without worry at all.
Secondly, that is a widget from a particular theme and not a plugin... ;)