Can we please synonymize web-applications with website-design? There's only 23 questions with the tag and all that I've seen are applicable websites in generaly, not limited to web applications. As such, the website design tag is more applicable.
I think the two serve different functions though web-applications doesn't appear to be getting used properly very often.
Things like Pixlr would be a web-application. Webflow would be another web-application.
Questions about their usage though could be tagged with just Pixlr or Webflow and whatever other tag(s) is appropriate... print design, typography, page-layout, etc.
I don't see any reason to keep web-applications at all.
Would destroying the tag be more appropriate?