Okay, I see.

terrecotta pot

Yeah, I probably need to do that with a couple Jade cuttings I just bought, as I understand that residual moisture in the root area is bad news for them. Also, I evidently need to swap out the soil with a courser mix, possibly even just small pebbles.

They'll certainly shed microplastics, but it's not really a household environmental source concern. The main pathway is through eating or drinking, so if you had edible plants in plastic pots then maybe. But it's still not nearly as much as plastic food containers, especially if you're using them for prep, or the worst, reheating food in the microwave in plastic.