Well, talking about workarounds, I can also "just" use Acrobat and search all the files in my local Paperpile folder. But this is not integrated/user-friendly approach to handle search.
Note that in Google Drive it does not seem to be possible to specify a folder to search. It would also be nice to have a context of the search result, which you do not get in google drive.
But I agree with you - if users don't ask for it, why bother. Speaking for myself, I do think this is an important functionality.
You don't happen to have a list of features under development that you do consider important, do you?