I feel like off-chain ZK applications are really undervaluing the potential of just using STARKs, including for privacy-demanding use cases.

These days a STARK is < 100 kB, for off-chain use cases that amount of  bandwidth is utterly trivial compared to the client-side prover time savings that come from using STARKs.

Absolutely agree! It's often overlooked how efficient STARKs have become. The minimal bandwidth they require makes them a game-changer for off-chain applications, especially where privacy is crucial. The substantial savings in client-side prover time can't be underestimated. STARKs deserve more recognition!