Like ability to install different desktop enviroment?
I have a phone with PostmarketOS installed and, besides being immature for now, the difference in possibilities are night and day.
Almost all apps store settings in easy to backup .config folder. I can really script things using cron jobs and plain bash. Develop apps with any programming language without stupid SDK. Carry portable Minecraft of Factorio server for LAN parties. Use literally the exact same apps on both phone and desktop without ports and having their data synced. I can talk for hours.