Biggest change for me is /tmp behavior. In Debian 13 /tmp become RAM-disk by default (instead of files on the file system) and uses up to 50% of available ram. But as expected of Debian the release notes included an easy fix to restore normal /tmp behavior for people and applications that place many small or large files there.
>"You can return to /tmp being a regular directory by running systemctl mask tmp.mount as root and rebooting."
I kind of wish the distros had decided on a new /tmpfs (or /tmp/tmpfs, etc) directory for applications to opt-in to using ram-disk rather than replacing /tmp and having to opt-out.
https://www.debian.org/releases/trixie/release-notes/issues....
>"You can return to /tmp being a regular directory by running systemctl mask tmp.mount as root and rebooting."
I kind of wish the distros had decided on a new /tmpfs (or /tmp/tmpfs, etc) directory for applications to opt-in to using ram-disk rather than replacing /tmp and having to opt-out.