And you seem to mistake "competitive" for "comparable"
The competition in PvE is not against each other but against the boss, and in this regard, a paladin without SM can compete. period.
Now if you're going to look at who has the bigest dick on recount all night long, sure you will want to bring a SM, but then again, why not bring a mage in the first place and pay some dude to PI you everytime it's up?
Does bis do the same damage as non bis ? duh
You realize half of the raid playing more "supportive" DPS classes aren't "competitive" by your definition, despite being arguably the most important elements of a raid right ?
that's a really sad way to look at raiding