Visual similarities from other, present day (or at least relatively recent) cultures could have been pulled in as well but you’d still have to ask why do it, what’s the point? It only has validity if culture A is (strongly) influencing culture B and you want to clearly show that influence. Here (the Ice Age art exhibition) the motives behind creating the prehistoric objects on show and modern pieces of art are so far removed one from the other that to somehow draw a meaningful connection, or a relationship, is nonsense. I’d even go as far as to say that trying to establish such a connection does, at worst, denigrate those objects from our distant past and, at best, is patronising.
As you rightly say, “I don't much like being led to make those sort of comparisons.”