(I'm only half joking. A system that's always ten times slower than the optimal solution, can still be beneficial to one that's quadratically slower than the optimal solution. Or it can be worse, it depends on how big your instances are.)
Your abstractions might change in a way that they break your tests in a major way, and not only do you end up re-writing a great part of your code but also of your test set.
Not enterprise: event --> action.
Enterprise: event --> abstraction --> abstraction --> abstraction --> abstraction --> abstraction --> abstraction --> abstraction --> abstraction --> action_parta --> abstraction --> abstraction --> abstraction --> action_partb abstraction --> abstraction --> abstraction --> action_finalizer.
Source: seeing it from the inside.
