More Horizontal Progression please

[Gilthas]

Just because you are multiple classes doesn't mean you need to be good at all of them.

You don't have to, but you should be allowed to.

Each job needs certain stats to fill a role and every different job that fills the same role needs the same stat.

Vertical=Items don't scale= Player needs to have couple of sets for one role if has three healer jobs at different levels.
Horizontal=Items scale= Player can have one set of gear for one role even if they have three healer jobs.

Horizontal Example: You get a ring with initial stats usable at lvl 15. The stats increase at 20 and again at 30.
Vertical example: You get a ring with initial stats usable at level 15. Then need to own another at level 20 and another at level 30.

The issue you claim that only vertical progression has exists all the same for horizontal progression. Likewise, the solution that you're presenting as to why the problem doesn't apply to horizontal progression (gear scaling with your character) can be applied to games with a vertical progression too.