[lewisl9029]

Yes those are definitely not the hardest problems in this space. I was only referring to UX-related features in my original post (i.e. rather than the much more tricky privacy and security related ones), ones that I couldn't figure out how to actually implement in the context of a client-side web app. Impossible was probably too strong of a word to express that.

Thank you for all the interesting ideas and resources though! They'll definitely come in handy when I eventually revisit this space when I have more time later on.