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> How do you "undo" to yesterday when you change your mind about something???

One might argue that developer time is valuable enough to ensure that it's spent on things that won't be "undone".

That's totally unrealistic. Often it's not the dev. that changes his mind, but the client. And since they have the $$$ you will be "undoing" previous work.

Exactly. Any good development process and software architecture must be responsive to change without enduring huge problems trying.

What happens when you introduce a bug that isn't discovered for 6 months? What happens if you think of a better way to do something? What happens if you're working on something and the power goes out, leaving you with partially-completed and saved work with no editor history? And so on...

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