It also entirely possible that a full Survivor specialty has other stuff on it that doesn't appear in the playtest package or isn't currently finished. Think about building a Survivor type package of feats in 3.x or 4e. In 4e, I might pick out Toughness and Durable first so the character can withstand a beatdown and keep going, and then at higher levels grab more anti-condition and NAD defense at higher levels. 3.x is a bit tougher, since Toughness there is not so good.
The 5e specialty might work along similar lines - Toughness is pretty good, so you take it a few times to get low levels and develop a good base of HP and HD. The higher level stuff might have other feats in there, like saving throws or whatever.
But a lot of the specialties seem sufficiently weak that an Archer specialty fighter versus Survivor spec archer fighter will come down on the side of the survivor. Neither Sniper nor Rapid Shot really improve straight up DPR.