That's the beauty of the relic weapon. Some people will swear by det/crit. Others with acc/det/crit and yet others with SS/whatever. Nothing wrong with putting SS on there.

And as for "swapping on the fly" - well you can't do that in battle which makes it useless. Stacking STR only accessories is fine for older content or maybe even WoD. If the OP, or another player, is in FCoB progression, you'll want that VIT. So STR+VIT accessories are very handy. Increases tank DPS and every bit counts when all of these fights are tight DPS checks.