Question about the change to job requirement

[Yonko]

It's a place you need to be at anyway as a legit player, that quest is right after you have joined a GC, which gives you retainers and your chocobo.

You can easily hit 50 and spam lower level content without unlocking a job, so I'm not sure why it's a RMT countermeasure.

I believe lots of RMT use BLMs for the AoE abilities which mostly come from the job and not the class.