I concur. Something like Genealogical Evidentiary Standard would be more suitable. But that whole topic is outside of RM’s control.
Big concur! In fact, color coding by proof value was a fairly recent feature request from @EmmaHP. Fact Colour Coding
Meta data tagging. If people, facts, sources, citations, media etc etc supported meta data tagging (and the reporting thereof), you could create hypothetical items and tag them to give them that distinction.
Side note, you can use the “floating person” concept you add people within the database that aren’t directly connected. I have several such people that I’m researching in my tree.