"Let me give you an example from Photoshop’s history. It’s hard to imagine now, but for many years Photoshop supported only a single level of undo. Customers rightly clamored for multiple undos. They didn’t ask, however, for the History palette, much less the History Brush, snapshots, and related other features. It’s possible that the PS team (of which I wasn’t a part until later) could have delivered a simple, straightforward multiple undo system sooner than they did. By looking beyond the immediate requests however–by really thinking about what we needed, not just requested–they were able to deliver real breakthroughs that remain unmatched more than 10 years later."
Read the rest of this excellent post by clicking here. Be sure to visit the referenced discussions on John's blog. A great refresher is his old post - the Secret Life of Smart Filters.
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