Semantics. If you go to Polymer website, it says this: "The Polymer library is in maintenance mode. For new development, we recommend Lit", and it links to what

Semantics. If you go to Polymer website, it says this: "The Polymer library is in maintenance mode. For new development, we recommend Lit", and it links to what literally everyone I've seen calls lit-html (because that's how it started). React is also just a library that handles rendering. But sure, "it's different".