I main BLM and have found situations where healers go down and if the tank is still up I often will spam Physick, but 90% of the time this happens I found the potency of my healing is just not enough for lvl 50+ content to prevent a wipe.

My stats are:

STR 89
DEX 205
VIT 338
INT 470
MND 148
PIE 243

So as you can see my MND is really not helping much at all. I think it's better for DPS jobs to maximize their attack stats, to help keep fight times shorter. That way we can reduce the risks of slip ups like healers/tanks dying. In regards to helping to boost the whm's curing on bosses I have seen some WARs who have a pretty high HP buffer that can help get recovered...but again, it's usually not worth the effort given how weak our curing is.