There's always a mentality that favors being able to help others through means other than pure damage. That I think is the biggest reason why Dancer is so popular despite it not being a healer: it filled a niche that Bard mains found lacking with their previous job.

The problem is that I think support is being toned back to make job design easier, which is a shame, but if Astrologian proved anything, it's that support stuff is really hard to balance properly.