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I guess. I was thinking about it because of all the research about interleaved, variable and retrieval practice (I should add that your blog actually gave me the initial ideas for my Master’s dissertation…so thanks for that!) that kind of shows that these ways of practicing increase the number of errors but are more effective in the long term. They sort of make things more difficult in a good way (hence “Desirable Difficulties”) but I understand that if you are nearning a performance, you want to try and practice in the expected condition(s) and not in others that you know for sure won’t happen (like playing on a different piano).