I know this might seem like a "who cares" sort of thing since the industry has standardized on the three listed, but I find all three overkill for a lot of things and, for example, keep my small projects in Mithril. But then I'm hit with either using Construct UI (which is honestly ok, this is all internal stuff), or having to make all the components myself.
What makes it such an impossibility for production? Even if, as in the case of Ionic, they provide web components but also wrap them up for React, Vue and Angular.