Because it was not intentionally (or otherwise) de-optimized by the then-or current-developers of Monero, who were the ones who in fact optimized it and released the fixes as open source, to the great inconvenience and frustration of those trying to stay ahead with optimized private miners. This is well-documented; there is no dispute over it.
Yeah right?
And we should just take your word for it?
Isn't this just the thing you are against for?
almost reminds me of this...
I did not have sexual relations with that woman, Miss Lewinsky. - Bill Clinton.