I created a mini knowledge center and brought together videos, documents and quizzes. The request was for the user not to have to pick the type of information that they are looking for but to pick a topic and be able to see it all pertaining to that particular topic. I have information in Share Point Lists, Stream and Forms and brought them together through New Style Share Point pages. It works perfectly if internet works :), but one can easily get stuck in SharePoint between pages and sites and so on.
If the PowerApps Search would be able to look into multiple lists (assuming Share Point or PowerApps would integrate with Stream and Forms) that would be awesome.