The form factor is just really great for a pocketable device, and being able to close a GBA SP really feels satisfying to put away. Same with the (larger) DS.
Personally I’d like a fingerprint reader notch on the back of a Z-fold style phone. Not a fan of the “in-screen” style. Tbh i probably should just not use biometrics unlocking to begin with.
Exactly what I was thinking about.