I would imagine not all saññā are exclusive to a physical body. In gandhabba form the mind still craves sights, sounds, and some smells, but as the mind wishes to continue separating, three (or maybe two and a half) senses aren’t enough. Instead of one way of experiencing an object, it craves three so it can continue separating good objects from bad objects. The saññā derived from the qualia of touch or taste (aka the sweetness as a mind interpretation of sense contact) is necessary for this separation.
If there was a way for the mind to get a body with ten senses in the same way as our normal five, it would definitely take that.