When do the training wheels come off?

[Silfar]

I am by no means a perfect player but I wonder about some of these "new" players. Trying to level up ninja, running leveling roulette, end up in garuda 4man. Get a level 44 gladiator yes gladiator. My ninja has more hp. His gear is a mix of caster, dow gear and 2 tank pieces all below level 35. Tank runs in can't stay still and all 4 party members are taking turns tanking.
Takes 2 attempts to finish and when we finish I get on to the tank and the healer jumps in cause hes new.
If you only have 1 class shouldn't you know the ins and outs of the class. Square has made the game so much easier giving messages to do job quests, not requiring leveling a second class to unlock a job. How does one get a tank that high and be so bad.
Thats 2 primals and about 7 dungeons he got through to unlock the fight. So they either got carried by a high level friend or "nice" party members and when they should have been kicked and taught how to play the hard way and or found a game more suited to them. So what is the cut off for "new".
This also leads to fun on things like expert roulettes in AA I was healing and got a ninja and a black mage who could only single target and not use half of their kit. Ninja most used huton and 1,2,3 combo only aoe in about 2 fights. Black mage only used fire 4, no flares, 1 thunder 4 maybe 1 foul not even any fire 2s.
I get people are "new" and am willing to help if I can but you can only help the willing, and covering for their faults instead of calling them on it only makes it worse in my experience.