SCH, Good Sub Or Not? Lets Discuss (no Drama Please, This Is, For Once, A Serious Thread)

Like the title says.

I know people would say that WHM/SCH and SMN/SCH are great, so lets not discuss those.

What about RDM/SCH? Now with Composure, you get an excuse to....well...not Sublimation yourself, but still keep Light Arts on yourself if you are main heal. SCH/RDM works, why not RDM/SCH?

How about BLM/SCH? I know, most of you guys will say "not for merit situation" but seriously, what about for non-merit situations? Like when you know you aren't going to have time to rest, and that SS/Blink usually wears more from timer than from usage? Like farming in sea/sky? Dark Arts also saves you 28 MP per AMII and 35+ MP per T4, which can add up quicker than shit. Also, if you have a Sorc Ring, why buy gears to knock your HP to 75% if Sublimation will do it for you?

Your thoughts?

Reason why I'm asking because....well....since my SMN is at 75, and that WHM looks fun to level, and like hell I'm ever going to get a Soboro, I'm thinking about leveling WHM next, but would like to go WHM/SCH all the way. Figured if I have SCH at 37, why can't I use it for BLM/SCH dynamis runs or sky/sea farms? Thought I would ask the "pros" and "emos" here for thoughts first though.