I don't understand how (or if) skills scale up with character level. I have two low-level characters in Diablo 3.
One of the skills my Demon Hunter character uses is Withering Fire, which I like because of the reduced initial cost. Will this skill (rune) still be useful at higher levels, or will I have to use the higher rune versions later in order to match later monsters? Or will the reduced cost not be relevant later when I have enough Hatred anyway?
More generally though, my question relates to using the higher level runes with skills. Is this the intention? It is expected that by level 30, I would be using skills and runes of, say, between level 25 and 30, rather than still using ones from much lower levels?