Having to ILL books from around the world. Talking to some librarian or archivist on the far side of the planet because they have a book or journal you need but it’s not an item they can or will ship, so you have to ask them to photocopy or scan it and send that to you. Deciphering cursive from 200 years ago in a language you barely speak. Asking an archivist to handle a physical object with white gloves and describe it and interacting with it to you as well as taking pictures and sending those along. Traveling to a historical society and spending a few days reading some local person’s journal or diary…
Research is so much more than a quick keyword search of easily accessible digital resources.