Swallowed creatures are considered Unseen Attackers. Yes or No?

Quote from Pantagruel666 >>

Quote from SunIsGettingRealLow96589 >>

The stomach of a carnivore is basically leather. It has to be tough enough to eat bone shards, claws, teeth, without tearing.

 Realism is really not very relevant to this discussion, because most animals do not swallow their prey whole or alive, and the exceptions will at least make sure they are incapacitated.

Realism only matters to someone invoking "realism" that inside a stomach should be soft and easy to cut.

And regardless of how hard or easy it is to.cut, the simple fact remains: who would design a monster where its a straight attack roll to hit the monster whether you are inside or outside the monster? If thats hownit works, being swallowed js probably ther safer place to be than outside and open to bite and claws.

No because all swallow actions involve automatic and enormous acid damage at the start of each turn... You never want to stay in there.