Please give an example of a system that is right on the borderline between "properly optimised" and "improperly optimised".
Isn't this an oxymoron since you can't optimize a system? (Ie you can only optimize it for backtested results, not future).
Personally I would consider that basically every trading method or system that has been trading realtime for a period of time should have been evaluated "tested/ proved", whether by computers, manual, eyeballs or profits/ losses. And any adjustment or improvement that has been made during the process of developing the method/ system can be considered Optimisation to certain degree. Saying that trading a system without Any adjustment/ improvemnet (aka optimisation) would be beyond my comprehension. That's why I think practically every profitable system is probably a properly optimised one.
Or forward test on a good sim, which I believe even one should do after backtesting, atleast for a couple of weeks.