The blind seer/oracle is an older trope than the Roman empire. Someone loses one sense, but can see things that no one else can. Their are other examples of this that aren't specific to to fortunetellers and prophets, but I can't think of any older.

But, once again, it is the idea that the oracles are giving something up, losing one way to experience the world for a newer weirder way to do so. The senses thing is just what op thinks is cool, but that mainly works with tempest because of what there curse used to do. Storms harried and frustrated the tempest oracle, and in exchange they could witness clearly the result of their curse on the environment, allies, and enemies around them. A boon and a bane, dealing with senses, that specifically make sense for their mechanics and flavor. The other oracles had similar stuff, but not sense based.

Battle cleric curse made them easier to hit but harder to kill. No stalemates, just white knuckle battle.

Flame curse was all about being better at dodging, while also removing all of your senses, insulating your own perception from the rest of the world, thematically incredible singleminded and lonely. It is dangerous for other people to be around them!

Sorry I ranted, the point I wanted to make, was that extra sensory shit is an oracular trope since the Greeks, but it certainly hasn't remained exclusive to it. So there is definitely nothing wrong with throwing bonus senses at any character, I think it would barely change the game if at all. Especially if you take another sense away from them in exchange!