It's the combination of damage and healing a RDM is offering. No other job can clear the dps checks while also providing a strong, (nearly) unlimited heal.
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Part of me now wants to unlock RDM and give it a go >.<
I never touched Blue Mage, but when they increase his level cap to 60 he should be able to enter PotD(?)
How good is BLU compared to RDM when it comes to soloing things?
RDM has damage and healing output that is necessary to get to 200. Other jobs can make it very far without the healing with sustain pots. The only floor the other jobs have serious issue with is floor 180. At around 10-15% he starts to spam meteor. The cast is much faster than the level 80 version. It drops you down to 20% of your health. He then casts it again a few secs later so the pots can't get you back up to safe levels in time.
Currently BLUs strongest spells would instantly fail them on solo runs, their rotation would put them at low dps levels, their sustainability though is high with Mighty Guard for traps/bosses's big attack, white wind for quick heals, it could also be possible everything would be susceptible to Doom/Missile/Tail screw or any of the debuffs BLU brings.
If BLU is allowed in with its current kit the wall would be the 180 boss due to its lack of damage but that could change based on any new skills it could get.