The deal obviously not only in desire of tape sound, just we has a case when device can goes beyond its purpose to a large extent, if you want (here i can agree with @plexuss)
And there is many similar cases, for me it for example octavox\quadravox, which i grab just because interesting resonator+delay abilities (despite his positioned as harmoniser - frankly i don't need harmonizers at all). Or Acon Digital restoration suite, which i found interesting for spectral transformation tasks, and restoration tasks do not need for me. (The same about their Deverberate).
So, in Cassette case, if it gives something new among existing effects (exactly regardless of their classification), why not.
But, ofcourse, I would not want to belittle its ability as a casette emulator too (although I have nothing to compare with - this is first tape emulator plug that i tried) - but it really sounds like tape.