Provoke and shirk are one in the same honestly. In 8 man savage content it's damn near required to have shirk on you hotbar with a /2 target macro. It's not something you would ever use in "normal" content.
So people using provoke over and over are either trolling for fun, Or they really don't know how the skill works at all.
Early ARR this was all you saw as enmity worked off of damage/skill modifiers until you got your stance which helped much more. This was a huge pain when players got there weapon relic in ARR and you had to out DPS that as a tank. BLM and DRG come to mind.
I still see some players using provoke every single time it's ready after the ShB enmity changes. Politely say "Hey, you don't have to provoke at all...just AOE and DPS you got the hate."
FFXI this was at the core of tanking. You had to constantly be using provoke w/e it was off cooldown. Enmity was completely different though as it was based off of damage/heals/self-heals/ enmity modifiers. There was no stances in FFXI so you had to always be doing more damage as a tank. Paladins were great at this as enmity gains from self healing were typically higher then damage enmity.