The filesystem method of finding is very limited. Mostly by folder/filename (.format). To be able to use alternate, usually results in a duplicat file beeng needed.
OTOH A Library manager can use Tags (+ or -), Author (or a fragment), Title (or a fragment), or Comments-Details (if present)
BTW this is not just a Calibre bene. Photos, Music, Movies all have custom Library apps for similar reasons.
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