What's harder?
Setting someone up perfectly and playing off their space, or being able to perfectly capitalize off the opportunities your teammates create and baiting yourself for them to get kills
setting up takes decent game knowledge and awareness of positioning, but the IGL should cover most of the information relayed, especially if they die early.
on the other hand, entrying and making space is definitely resorted to not only the most mechanically gifted and headfirst players, but I'd say they also need to know what to request from their team and how to entry accordingly. they also need to acknowledge off-angles and certain antis/set plays that the other team can make to counter your space making abilities