Stayed in a hotel recently - the shower hose connectors at both ends leaked badly. They were a mess of sealant and PTFE tape.
I reported it to the reception. She said the "plumber" had recently fixed it - and she would call him back!
Presumably he doesn't know that a rubber washer is needed and the thread is merely for providing a clamping force. I wondered if he really considered himself to be a "plumber"?