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The hinge allows you to peel in both directions (i.e. forwards and backwards across your potato/carrot/etc. without lifting the peeler.) It also means it can track a rough surface more easily. I haven't had any issues with the hinge, and I use a dishwasher for cleaning - what issues have you run into?

i'm almost never using a movable one but:

- on the practicity: i can do exactly what i want with a fixed one, without risk for the blade to slip

- small dust and bits tend to gather at the junctions and sit there

Which also makes it usable for left-handers.

The movable blade makes peeling oddly shaped veggies or fruits so much smoother

I find the movable ones cut a thinner peel, probably the blade is held at a more optimal angle if it can find its own position, or maybe my particular movable one is just better-made than my fixed one.

For produce with a tougher skin than innards, the blade will deflect off the inside of the skin and steer itself along that interface.

Fair enough, I don't usually encounter that. I'd probably use a regular knife in that case.