You like to assume im doing these things, when in fact you are quite wrong. Again, stop defending someone when you don't know what you are defending them for. (Hint: i wasnt attacking him at all, even he understands that)
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One of the things i do is try everything out for myself, even the crappier trinkets, and i generally keep them in case they ever get a buff. I actually made a mouseover portion that i put into practically every ability i have for the Zuldazar trinket that simply applies the absorb portion whenever a stack is up rather then waiting for 6 stacks before using it. It saves having to manage another on use trinket and kind of makes it "passive" in a way.
You're right, there is no outright wrong way to gem, unless you are gemming STR and dodge gems as a holy paladin you're pretty much set up to go either spirit, mastery, or haste. Ive seen all three. Out of the three holy paladins in our raid including me two are full spirit (im one of those) and one is trying to focus on mastery.