@vannn , a cook strikes defenseless meat with a long windup, to cut it into pieces exactly at the place where he needs to.
A swordsman can't afford to that - in a fight, that would give the opponent plenty of time to defend and counter-attack. So to a swordsman, "cook's strike" would be an insult his instructor would give to an attack that leaves you too wide-open for a counter-attack.
Well, anime swordsmen (and swordsmen in some other visual media) "telegraph" their attacks much like cooks. Because it allows the viewer to see what's going on, and looks good. If you watch some sport fencing, it's pretty much invisible to the naked eye, and reconstructors' martial arts don't look that good either.