Why slab is judged on basis 2. If it is less than 2 Two way and greater than 2 One way?
Why number 2? Why not any other number?
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This Video should answer your question. Please take a look. In reality, one way and 2 way slab is a quick way of deciding the load distribution considering only the nearness or farness of the support. In a simple way if I explain. more far the supports, less stiff that direction. More nearer the supports, more stiff that direction. The load goes more towards the stiffer direction supports. It is seen that when the span ration is more than 2 the slab is behaving as a one way slab towards the stiffer support. However there is a shortcoming here. The size of the support or the edge conditions is not accounted. The stiffness of support is ignored. Also presence of column and the size of column is also not accounted. You can say that slab is supported on beams and beams on columns. However reality is that at column beam and slab junction, it is a huge stiff concrete and the load distribution depends on this too and not just based on support distances.
See this video and you will be clear about this aspect and also about membrane vs shell in ETABS