What a lot of players don't realize is that the hard case on a Gibson or Fender was always an option until recent years. Same with a Martin. The guitar did not come with a case of any kind, and in fact, several choices were available. If you wanted the factory hard shell case, it cost about 20% of the price of the guitar. My '65 SG Special cost around $250-300 new and the case was another 50 bucks. I was there when my father bought it for my brother, and I remember them dickering over the cost of the case.
At that time, many if not most guitars were bought in a chipboard (sort of a heavy cardboard) case with some cloth glued to the inside, no padding, and a cheap vinyl covering glued to the cardboard, because people simply couldn't afford the hard case plus the new guitar. Aftermarket cases were big business.
If that $50 price seems cheap, consider that my '65 Mustang cost only $2500 new. So fifty bucks was a decent chunk of change for a case!
PRS was one of the first manufacturers that I can recall who threw the case in with the price of the guitar. But of course, those were the core line models, that was all PRS made at the time.
This is why I don't really agree with the statements "an X dollar guitar should come with a hard shell case." Should? Where is it inscribed in holy writ that this must happen? If it's someone's preference to only buy a guitar that comes with one, fine, do that. Find one you like and go for it.
But I see no reason to make pronouncements either way. The S2 doesn't, that's the deal, don't like it, don't buy it. There are alternatives. Simple. If the S2 is what you want, and you need a case, they're not expensive. Buy one. Sell your gig bag on ebay.