not really no - as a /sit macro functions differently than mashing X which makes you both sit and stand
if u mash a /sit macro you won’t trigger reckoning/enrage/blood craze
but if u mash your button which makes you sit and then mash it again to stand back up as the mob hits you, you will trigger those procs due to spell batching
spell batching is the glorious catch all that was in Vanilla and allowed creative gameplay usage such as this and double mage sheeping, or double gouges, or casting Lay on Hands on the tank, losing all of your mana, eating a global cooldown and hearing the cast go off…but the tank still died anyway
game/server technology has evolved since this was the defacto technical limitation during the time of retail vanilla wow, but the devs have made a design decision to basically slow down the batching ping for Classic
^^^ 100% blizzlike due to spell batching - read the blue post above where they discuss remaking spell batching as it was in vanilla for classic ^^^