Not talking about overloading. Remaining within the letter of the FM does not mean you will make component times, the manual does not tell you how to operate just sets limits.
Components rarely fail, they just don't last. If you have ever had to maintain your own aircraft you will understand that is an unnecessary expense.
Wingovers are an indication of an overall culture the results of which will have a greater than 1% effect.
Nonetheless the argument from some seems to be that since the aircraft can do aerobatics and test pilots have shown that it can be done safely then it is ok in the bigger picture.
With that logic they also test aircraft well beyond VNE quite safely, so let's also do that from time to time. It is also unlikely to contribute more than 1%.
But why stop there. If you are a good, capable pilot let's just push all the boundaries every now and then.
Eventually all those 1% add up.