Know what is useless? Your Class.

[Wolf_Gang]

It looks as though they considered it at some point, then ran like hell in the other direction ever since like rouletting PHaros Sirius: "Too hard, i'm leaving". What's sad is that the crude, half-arsed cross-classing stuff that remains only reminds us that 'class versatility' was supposed to be something that existed at some point, but it's never going to emerge as anything useful.

I think it's more along the lines of:
They had an idea to go in one direction but didn't want to abandon all the existing assets from the 1.0 engine. So we're instead left with this mess of a compromise.
And when they finally do add more jobs, they're probably going to make sweeping changes. It's the same thing for Materia system, now they're developing a new one.