Situations when in design 99% is different than 100%.
Creator when assembling something out of many pieces, one need to stumble upon very rare situation when all of them work. So often instead of trying to tweak (or band, customize) existing variables a creator is better of discarding a large number until they stumble upon ones that work compeletely
Examples:
Me using database creators to link things β creators are very very helpful in many respects but for external eye they are not. This seem small comparing to the gain, but may prohibit at making my work good for the user. I mean having good enough incentives for the user to read and clickthrough.