Great comment. Most if not all other comments were recommending/complaining about parallelizing horizontal slides. Like you said, vertical slices are generally

Great comment. Most if not all other comments were recommending/complaining about parallelizing horizontal slides. Like you said, vertical slices are generally valuable to an end user, even if that first one is ugly, not user friendly, etc. Horizontal slides are a gamble. You parallelize, but risk wasting considerable work.