Okay I know it's not going to be easy but I'll do my best to explain what I mean. There's a word in my language which literally translates to English like this: "lack-completing". I know it might sound odd to natives and I'm sure there has to be a word in English that carries the same meaning, I just haven't been able to find it.
I have found 'novel, innovative, revolutionary, unprecedented' but these are not the ones I'm looking for. Basically this word means that there was a lack of something (either of an idea or of an item) until now but finally it has been 'invented' or 'made' and thus it 'fulfills/completes/closes' that lack/void...it makes that 'lack'(of the given thing) cease.
Upon suggestion, here's a list of example sentences where this word would probably fit.
- This channel on Youtube is simply _______. I'm sure a lot of people felt its absence but it's great to see that somebody is finally creating content about this now.
- It used to be problematic to handle these situations, but with this new, _______ app people can manage their issues musch faster.