In the early days of MMOs there were no "do overs" when it came to making choices. Your class was your class, and your abilities were your abilities. If you wanted to change those choices, that's just too bad. Over the years developers have softened their implementation of character advancement, gradually allowing more and more forgiveness for mistakes and experimentation in terms of talent trees, abilities and powers. Some of these systems have been much more outlandish than others. For example, Tabula Rasa allowed players to make complete copies of their characters at certain points in the leveling process to allow them to more easily experience the game's branching, and mutually exclusive, skill trees. Rift allows players to mix and match souls on the fly, combining to create a nearly limitless number of skill combinations.
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