I think you’re advocating a “wait and see” but I feel like we know enough to start regulating

Did you read the same article? Two items I found right away:

“If the body is constantly producing this inflammatory response, there may be an increased risk for a host of diseases. The presence of microplastics has been linked to cardiovascular disease and reduced sperm count and suspected of links to lung cancer, colon cancer, and dementia.”

"Some of the most common additives in plastics, like bisphenols and phthalates — which make products more flexible, durable, or flame resistant — have been extensively studied for decades. These additives are known to be endocrine disrupters, meaning they can wreak havoc on our hormones; this can be particularly dangerous for the developing bodies of infants and children. "