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Leather is biodegradable and an accepted material for cars. I don't see why the same shouldn't apply to this.

Biodegradable plastics typically have a melting temp on the lower end. PLA for example is 60c.

I'm not sure many people would be happy coming back to their car to open the door to a plastic blob on their floor.

I'm pretty sure chrome tanned leather is not biodegradable in any practical sense.

Put it in a healthy compost pile and it will get eaten away. Even bone biodegrades, given enough time.

Nature doesn't have compost piles, nor does the ocean's giant plastic islands.

If a material only biodegrades at 60 C, then it for practical purposes it doesn't biodegrade.

If it biodegrades at 60C in a month it’s probably gone after ten years in the ocean, which is a big improvement.