Warriors’ - as well as other classes’ - melee weapon Abilities, LACK a very common visual effect; a colorful (usually red or purple), semi-transparent Streak that follows Player’s blade/head of the weapon, as they strike
their enemy.
Examples: https://imgur.com/a/7O2iuvA
(scroll down to see more)
Examples in motion: https://youtu.be/ZY0FweSi73w?t=30
and https://youtu.be/RjJ_cBF22i8?t=56
Said visual effect’s NEVER visible in the current version of Classic and Classic TBC. But, originally, was always present in WoW during most - if not all - weapon swinging abilities. Before Legion was released, that is.
EDIT: Also, I suggest to make a “Bug Section” on the european forums. And, yes, I’ve already submitted the bug in-game many times, starting long time ago, when Classic was fresh.