Except RDPS is also painfully low, even more so after the Sam nerf. Besides, what exactly is a support job? What kind of support does Dancer bring that other classes don't? Monk and Ninja both boost raid DPS by 5% and are among the top RDPS in the game. RPR, SMN have 3% buffs and raidwide heals, SMN also has res, RDM has 5% dps buff, heals and res. You could basically say every class but BLM, SAM and MCH are support classes.

DNC has the lowest personal DPS as well as lowest RDPS (yes even with all their amazing buffs) across all categories except savage 90 percentile + raiders. At which point they're the 2nd lowest. The problem with DNC is for it do even do remotely well it needs 7 other players who do their rotations perfectly, sync burst windows with buff windows perfectly and never get hit with a dmg down and this is especially true for their dance partner. Then and only then does DNC put out decent RDPS though still lower than every other class but MCH. This is made worse by DNC being considered easy and a beginner friendly class. While playing DNC isnt hard, if you do not coordinate buff windows their DPS tanks severely, which is the case with most normal content Dancers and why the class is so much lower on RDPS than any other. So while yes beginner friendly, to actually perform well with DNC you need to play others who are playing on a very high level.