Some of them may be cider only varietals, which usually aren't super tasty on their own. This doesn't make them any less valuable, they just have a different use case.

For example, UK cider varietals include:

Dabinett (Bittersweet, high in tannins, well-balanced flavour, single-varietal and blended ciders)

Kingston Black (Bittersharp, high acidity and tannins, rich flavour, vintage-quality single-varietal ciders)