Those elements don't use polymer, they use lit-element - it is from polymer team and uses one polymer mixin, but its not polymer base element.
You can just import these into JS modules and use them in JSX. Interop is fine for attributes.
I'm perfectly calm dude.
What could we do better?
i don't know. wanna try putting up a codesandbox to use wired-elements in a react app? would love to learn. sorry i dont know your affiliation with the polymer project or react-polymer. it just didnt seem usable when i looked at it