I can't claim to explain all the hints, but my guess is that you are
ROSETTA'S STONE, a previous puzzle of @Jens', as ROSES STONE on each first letter cannot be an accident
Recent in youth, I earned some praise
On time has passed, those were the days
So now I'm idle
E're by myself
Seeking a saviour, on any shelf
That puzzle went unsolved and un-attempted for a few days despite double-digit upvotes. Mirroring that, the real-life Rosetta Stone garnered great interest centuries ago, before it was cracked.
Some say I'm hard, but that isn't true
Though I require, some work from you
Oodles of hints
No hint was small
Even the title, s'plained for y'all
These lines tell us to go solve the other puzzle - it's not that hard! Though "Where art thou?" suggests we have to go locate it first.
As for the hint,
This would be a puzzle about the other puzzle as well as the "puzzling" Rosetta Stone.
As for the prelude "An appealing interlude...,"
I have no idea. Perhaps this riddle was a bit of an intermission while we waited for someone to solve the other puzzle.
I'm surprised to see
No reference to the language-learning software. Perhaps I am missing it.