This assumes that:
(1) Plastic can actually be recycled. Unlike a lot of other materials, it degrades rather substantially every time you try, and plastic quality coming out of recycling isn't generally uniform enough to make anything more than the big, chunky "recycled plastic toys and benches" you'll occasionally see. More and more, it's evident that "plastic recycling" is a myth mostly funded by plastic producers and crew, who wish to have it be seen as "not the terror it actually is." Hard on profits, you know, if people don't like your product. The Guardian has done some great work on the truths behind plastic recycling, and they're not pretty. That's before you get into the biological impacts of microplastics on "literally everything on the planet that's alive."
And, (2) that "biodegradable materials" actually do that in realistic end of life conditions. They don't. People date landfill digs by reading the headlines on the newspapers that are "slightly yellowed compared to when they were buried."
Treating plastic as the life-toxic sludge it is would be a far better start. At least with metal recycling, we know it's actually being put back into a smelter for recycling, and that it uses far less energy than the original materials (though "pure circular" with most metals is still a problem as they just dilute the various alloys down with virgin metal enough to make the additives not a problem in current systems).
"Oh, it's fine, it's recycled!" leads to far more plastic use than "No, we literally can't do anything with it, the best we can do is go burn it to offset coal use" (which is what my local area does with plastic, as it seems to have the best impact for the least cost, and the burn temperature is probably hot enough to decompose all the nasties...).