Pretty much, yeah. But you're better of stacking impen for pvp than additional resistances in most cases. Certain builds will merit stacking resistances to, or even above, the caps. Unless you are building to be somewhat of a bulwark (meaning sustain and survivability at the expense of damage, especially burst) then you should be fine with Major Ward/Resolve (and Minor, if you choose). Defending weapons can make a world of difference, especially if you use them on a secondary bar that only contains buffs/utility. My stam Sorc pvp build, for example, has 30k spell and 25k phys resistances with only Major Ward/Resolve active, with defending only on DW bar, and that bar contains no offensive skills at all. It is purely used for the ultimate, buffs, and healing.

Not sure if it is relevant to the post but if you are stacking resistances, nirnhoned is actually better than reinforced on shields due to how the shield Expert CP interacts with base resistances. This also holds true for heavy belts and gloves I think.it might also extend to shoulcers and boots, but can't remember.