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This model is too oversimplified! Reality is more complex than this model suggests, making it less useful in practice. We should really be taking these into account. [optional: include jabs at outgroup]
This model is too complex! It takes into account a bunch of unimportant things, making it much harder to use in practice. We should use this simplified model instead. [optional: include jabs at outgroup]
Sometimes this even results in better models over time.