Why don't we have more DPS abilities ?

[Azurarok]

Exactly PCT’s filler would be boring as dirt if it was just fire in red, aero in green and water in blue. Its filler works because it’s 4 seperate parts that interact with each other

It's interesting that's how most combos work in PvP. I think they're largely not designed to interact with the rest of their job's kit since its encounters are way faster and unpredictable. You're never guaranteed to actually be able to execute them fully so they can't put much behind it.

Their idea behind healers probably also runs under a similar notion, incoming damage should be at varying rates and amounts via content design and human error, leaving less room for a real rotation, but content design is very static and they also don't leave room for human error in harder content, where it's more likely to happen.