I can't tell if they missed the joke about losing 10 fingers and having to stop there, or if you missed their joke that you can insert the same finger multiple times as long as you only lose a bit of a finger each time.

All the above forgot toes

Those are not fingers (at least not in English).

This chain has got me wondering how we count in base 10, but we don't have 10 fingers instead 8 fingers and 2 thumbs. Maybe we have 10 digits, but digits can be fingers or toes so we really have 20 digits.

Is there a word in English which exclusively means hand-digits or fingers+thumbs or digits-toes?

Because people don't usually don't on their toes? It's easier to bring your hands into view than your feet.

In German we have "hand shoes" for gloves :)

You just broke my mind Russian mind.

in spanish aren't fingers and toes interchangeable?

they're actually interchangeable anywhere as long as you have a talented surgeon.