"Splits" were created to simplify workout planning, since using splits automatically applies some of the important rules for muscle building, so you don't have to think about it too much. Therefore, standard splits sometimes work, but they are often suboptimal when considering all aspects of the training plan at the same time.
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Splits are always a means to an end, to control the key parameters of training planning volume, frequency, and intensity (VFI). For example, if you train a push/pull plan four times a week, it ensures a frequency of twice per muscle. However, in practice, it often happens that, for instance, a frequency of two works well for the chest but not so well for the back since your muscles each need different volumes. If you then use a “clean split,” it might happen that one session is longer and more tiring than another, and you accumulate “junk volume” by squeezing the volume of a muscle into two sessions when it should be spread over three. This would be detrimental to muscle building due to the performance loss toward the end of the workout and the poorer training stimulus due to the “junk volume.” (“Junk volume” means performing training sets when you are too exhausted to effectively stimulate your muscles.)
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Moreover, depending on the placement of your training days, it might happen that the two pull sessions are too close together, and your biceps can't recover quickly enough. In this case, it might be better to train biceps during a “push” session. MyFitCoach takes all of these aspects into account comprehensively and always in relation to your individual situation.
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A holistic split might seem a bit confusing at first glance, but overall, it is very effective and efficient.