Quote Originally Posted by EdwinLi View Post

Of course they have to make the system work that so when a player joins as a Tank Role they are locked as a Tank Job with the ability adjusted to Tank Role and if they join as a DPS they are locked as a DPS and their skills are adjusted as a DPS Role.

They already can do this with Stances by having a Tank Stance and DPS Stance at level 1 and which stance the Job is in adjust the Job skills to that Job Role but no they have to stick with 1 Role per Job.
Kinda how I feel, same with AST and Diurnal and Noct giving 2 different effects, I'd have to assume they could also do the same for a job.