Not forgetting the thousands of extremely large “asteroids” now known to be orbiting other stars.
Long after I became an adult I read that detecting, let alone characterizing, exoplanets was essentially impossible. This view became even more widespread after the debunking of claims of astrometric detection of planets orbiting Barnard’s Star.
These days the ARPS provide data for the BAA Handbook and exoplanetary observation has become, if not routine, then certainly mainstream in the amateur community.