Anyone else refuse to use /SCH out of pure spite? :P
It's a terrible, terrible thing. I know this. But I still have a chip on my shoulder about pretty much every single aspect of what SCH is. It drives me crazy when every update SCH recieves something unique that would better suit another job, jobs or a blanket fix (most recent example: regen), "pre-emptively steals" spells or abilities that better suit or are needed by other jobs (pretty much every JA at 75), or steals spells from another job with no concern for job uniqueness, balance or just simple respect for the role other jobs play (elemental enhancing magic [stoneskin etc], tier V spells, Regen V, -na, the list goes on). It's insult enough that another job is introduced that is entirely based on casting other job's spells better than they can - having to then sub it for best results is just irony gone mad.
When /RDM became more practical I was overjoyed that I could play White Mage with a non-SCH subjob that filled the gaping void in WHM's arsenal - MP recovery - but I'm always acutely aware that /SCH just gets better and better as time goes on. It's a little ridiculous that /SCH has a positive effect in almost every single aspect of White Magery - the latest slap in the face being B+ enhancing magic for Boost spells on top of the barspell bonus I've lamented about for a long time.
I'll stress it again - a terrible reason, and one I certainly omit when advising new White Mages, but I've come across a few people who have leanings in the same direction when it comes to White Mage subjobs.