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Not if it replaces wood products that fully biodegrade (even tho many are chemically treated in other ways). That'd be a net loss, and I could see it being huge in terms of additional mass of plastics being added to the environment.

Unfortunately biodegradable isn't the same as compostable. Plastic can be biodegradable, and will/can biodegradable into microplastics, with all the issues microplastics are known for.

So I always take it with a pinch of salt when a brand toots the "biodegradable" horn a bit too loudly, come back when it's compostable.

Biodegrades is too fuzzy. What's the time horizon for that? What conditions are needed?