Why use Comparative for the Superlative meaning, as in: “важнее / скорее / больше всего”?

2018-03-20 17:42:48

важнее всего

скорее всего

больше всего

So far, I've contented myself with putting this down to just because, but I wonder why in Russian you use a comparative form to refer to the superlative notion of "the most ... of all".

Unlike "важнее" and "скорее", "больше" has a superlative form.

What about, say, the adjective "хороший" that has both comparative and superlative forms: "... всего"?