One of the challenges is that little is known about the impact of microplastics on human health and the toxic effects that may vary depending on the type, size, shape, and concentration.
I think everyone agrees that microplastic accumulation is not good, but how much effort should we dedicate to eliminating them. Like if we banned plastic food packaging, but used something that increased the risk of food poisoning by 0.001% would that have a net positive impact on our society's health?