Giving each job a second spec: would it work?

[Reynhart]

Seriously, you need to think a bit

It's not like one of the jobs is a Summoner, and like every pet skills is unique to the job so that you could boost them 1) to better fit the lore and 2) to adjust SMN without changing anything to SCH.

And, if you want to be technical, at lvl 50, SMN had 17 (By combining the 3 types ef Enkidle) unique skills and SCH 12 (Not counting Embrace twice).
At level 60, it becomes 22 for SMN 17 for SCH.
And Arcanist gives 18 skills. So they have almost more unique skills than shared ones, and they don't cross class the same skills, too.

So, in fact, Arcanist was the perfect example of how the system can work well.

EDIT : But, I admit that withtout the pet, if would require more thought to do the same for other classes, but it's far from impossible