I love gearswapping. It makes it unique. It's unlikely that say, a full tp set for any job would be 99.2 or 99.any_same_tier, but I would imagine that they intend for our tp sets to be mostly from [this] and [last] tier in order to fight [next] tier.

Same for ws sets. Healers and mages it's a bit harder, more refresh perhaps on mage gear, and maybe tanks will see more acc/haste+dt- on the same gear, so they can take less damage and do more damage.