The lower the cap more skill is needed.
Uh, no.
All caps require the same basic skill sets with the exception of caps over 220M, where money is not an issue. At 60M you essentially just shrink the player pool, which is not dissimilar to what happens with high cap drafts, just in the opposite direction. Because of the shrunken pool size, mistakes are harder to fix and there is less room for error but if one does one's due diligence then they are no more difficult than other caps. One could, I think, make the successful argument that 60M is more draft dependent than other caps where, given the larger pool of usable parts at other caps, one can overcome a bad draft with skillful moves post draft, whereas at 60M there simply aren't as many viable options to compensate for a unlucky draft.
For example prior to ATG 8, I used to loathe 140M caps because they were so draft dependent, that it was nearly impossible to recover from an "unlucky"draft. Now they have become perhaps my favorite cap because a skillful manager has enough options to still put together a competitive team despite a horrible draft and you get to use more of your "favorite" players.