On a dummy test, blm has parsed as the second best single target damage, with only sam doing more. The complains are like saying that Monk should be doing much more damage because his utility(as crappy as it is) skill does not works on a caster group thus they have no utility on that case.

Of course blm is gonna suffer on a heavy movement fight, but if you buff him you will make it godlike on those fights on which movement is not needed so outside of very minor changes blm is probably gonna stay like that, moreso when there are other jobs in FAR worse places (mch anyone?)

Even if its a role skills Blm are the job best suited for mana transfer something that both rdm and smn cant do at will due to lesser mp recovery