Although there were times when they got caught in slowed skills, and it was better to have some countermeasures to negate the slowed effect, this skill only canceled the debuff of attacking speed.
There were many other skills that could achieve the same result with other benefits to boost. It was no wonder why Blitz Attack was a normal skill.
Nonetheless, Sun Wuji could not hope for a better skill in his level of cultivation. The crux of his bloodline's deficit was where he had to sacrifice his speed to increase his attack and defense. Trading the speed too much would result in a backfire.
While he might not need much speed in his defensive stance, he could not say the same when he was attacking. If his offense was so slow that it would not hit the target, then why bother increasing the attacking capability at all?
