That is like saying multiplication is an abuse of addition. Avoiding needless work is a basic optimization technique.
False equivalency fallacy; as expected by the likes of you. An exploit is an exploit; that is an undeniable fact.
Also just exactly how can SegWit block AsciBoost?
It does not block it entirely. It blocks the covert usage of it. Segwit changes the block header in a specific way, which prevents the covert usage of Asicboost. In fact, Asicboost as is implemented in current Bitmain devices is incompatible with a lot of potential upgrades (which change the block header).
Since Greg Maxwell is the posterchild for integrity, and has never tried to mislead anyone in his life, it is safe to take his word for it without any evidence. /s
He's certainly more trustworthy than the likes of Ver, Jihan, Peter R and the other charlatans.