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What the tile pictograms are trying to show does not deal with the "look" of the tile, it deals with "lippage", which is one tile's edge being higher than the tile beside it. Nothing is perfectly flat, and lippage is more pronounced with certain patterns on tiles that are not very flat.

I am no expert, but a 50% overlap is commonly not recommended on longer tile because lippage will be exaggerated. That is what the third pictogram is trying to show.

The second pictogram is probably not very useful because it does not define a value for the maximum recommended overlap, but I think up to 1/3 overlap is commonly considered acceptable. Possibly they are trying to show that small amounts of overlap are preferred.
 
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