I would suggest the opposite - rather than having two jobs lead to one, it would overall be better (not ideal) to have one job fork into two specializations. This would prevent the Heavensward sub job issues and missing skills.

On the flipside, offering a 2-way fork for specialization doesn't automatically make it great. Illusion of choice will occur due to the game's design philosophy making more damage generally the best option.

It can work, but it needs to be handled with extreme care... which I do not trust them to do well given track records.