Good OS-native cloud syncing. The Windows Cloud Sync Engine is so useful and is now adopted by virtually every cloud storage provider, and crucially lets you keep your entire cloud drive visible as unsynced files and pulls them on-demand (ie. what Dropbox call Smart Sync).

Thanks to being freelance and working for different companies I have different files I work on in Dropbox and Onedrive as well as my personal stuff being stored on Proton and my Synology NAS through Drive, and none of these have linux integrations that even come close to their Windows or macOS equivalents. Things like Syncthing and rclone will do selective sync, so you aren’t forced to sync your entire cloud drive on to your laptop’s tiny SSD, but that still means half your files are missing and have to be accessed through janky browser interfaces 🤢