Indeed. And in addition to injuries, we also don't know how many of the freshman will be good enough for our top 8 anyway (especially at the 4). We're obviously still in great shape even if we don't end up with that much depth, but most of the top teams had it this past year (UM, UConn, and Houston got ~20mpg from 9th+ guys and Duke got ~12, while we got ~8).
They didn't do it by having some 9th guy stashed on the bench in case of emergency, so it isn't worth discussing whether that would appeal to recruits/transfers. Those teams played 9+ man rotations throughout the year, which is a much different opportunity.