Why put it back to performance/stock? I want it to last longer than 5 years, 40k miles? I like a happy computer that does not spit codes without reprogramming? I want to be ready for any state's smog Nazis? I already bought the parts and have most on? I think all the above are legit answers for me.
It is also a lot cheaper and easier than installing a top of the line, self tuning system, new cats and whatever other new pollution devices would bring it up to 2016 standards. Add a flex fuel module and variable cam timing on a stroker motor and I would be very happy and very broke.
With the older computer, I wonder if the new converters might run really clean with extra air and last longer.