I hope the Messages in iCloud updates eventually bring functionality more similar to photos where it manages on device storage more optimally. I don't like to delete my old messages but I don't necessarily need them all on my device. I just want something that is searchable and accessible when necessary but not taking 10s of GBs of increasingly sparse storage.
I call it "digital house keeping" (or lack of). My wife is super bad at that. She doesn't delete anything then wonder why her phone / Mac runs so slowly. I often see her badging 5 figures in unread emails.