Hmm, interesting point, but given they still have no information on the quantity anyway, wouldn't it make more sense for them to just rewind or restart back to the beginning? It's not just skill quantities, at the end of the level so many changes have already occurred (terrain etc.) that if they really need to review what to do differently, looking at the end state is arguably the worst place to do so anyway.
With all that said, your point is still reasonable, as is the opinion from Proxima that this tweak is probably one of the more low-priority things on the overall list of potential improvement. Especially considering that it is somewhat irrelevant for levels that start off with most if not all skills active, or are the easier levels (which incidentally are also likely to be encountered earlier by players) with extra skill quantities such that there may be very few inactive buttons during most playings even towards the end.