Actually, I'm going to correct you on this.
Gear they have available and gear they choose are two different things.
For example, Triumph earrings were like 600k on my server back at lv 75. Merman's earrings were 200k.
Merman's earring was a better earring for TP and WS for mnk.
If you chose triumph, then yes, you'd be a bad monk.
I look at it this way.
Gear + Skill > anything else.
Having skill isn't enough. You can be the most skilled person in the world and let's say use all lv 50 gear and you just won't cut it.
You can have the best gear in the game and no skill, and still be horrible.
If you have good gear and know how to play your job, combine the gear and the skill, that's where you get the best players.
Here is my perspective.
Gear = Potential. The better gear you have, the better higher potential you will have as a player. Your skill level = how much of that potential you are reaching.