No apology needed. That's the nature of any good conversation: you never know what direction it might take.
Regarding libraries with limited applications...I have a boatload of libraries that are
very limited in their scope and versatility - but I actually use them regularly.
I have, for example, Wavesfactory's StrumGTR Acoustic. It's just a collection of basic strums: major and minor chords, up- and down-strokes. That's it. It only works in medium-tempo songs that don't have any suspended chords or finger-picking. But when it works, it works just fine. I can throw in some acoustic guitar rhythm in less time than it takes to get out a microphone and tune my acoustic guitar. For $13 it was a nice addition to my collection.
I've also bought individual drum samples. For example, I have a really nice snare drum that's perfect for a certain type of song but not much else. I think I paid $4 for it. It'll never be my go-to snare drum, but sometimes it's the perfect fit.
I have a bunch of other one-trick ponies. A carillion - talk about limited applications! Love it, though. A glass marimba - still haven't found a use but it sounds cool. Toy pianos, wine glasses, kitchen utensils, dumpster sounds, backward guitars, and lots of spacey pads.
Don't write off a sound source just because it's limited!