In terms of developer time spent, working out thoughtfully organized and tidy stylesheets up front can save a lot in the long term (just like with any other par

In terms of developer time spent, working out thoughtfully organized and tidy stylesheets up front can save a lot in the long term (just like with any other part of the codebase). Maintaining and adding to stylesheets is difficult: they almost always (and quickly) devolve into the CSS equivalent of spaghetti code, especially on teams where you have multiple people working on them. The 'easy/fast' approach at that point is to just create a new style rule and re-class the majority of the elements you're trying to affect and it is just a vicious cycle.