The software on sid should be the most recent around, right?
Right , Debian Sid have the most recent versions of softwares because those package (latest) will not be never included directly on testing or stable , it will be uploaded initially to Debian sid , Some of those packages can be migrated to testing in order to be released in stable later on.
It seems to me that the software there is quite outdated.
Debian Sid dosen't recive a security updates , because the debian security Team keep eyes on the current stable release and the next stable release (testing) to quickly patch the newest vulnerability.
I never dared installing debian sid on my laptop out of fear that it was totally broken.
You can break your system by installing a buggy package ( e,g:unmet dependencies) , it is a good idea to use
apt-listbugs before installing a package through
apt on Debian Sid to be warned about the latest bugs.
apt-listbugs is a tool which retrieves bug reports from the Debian Bug Tracking System and lists them. Especially, it is intended to be invoked before each installation/upgrade by APT in order to check whether the installation/upgrade is safe.
Many developers and users prefer the unstable version of Debian for its new features and packages. APT, the usual upgrade tool, can break your system by installing a buggy package.
apt-listbugs lists critical bug reports from the Debian Bug Tracking System. Run it from within the APT session, in order to see whether an installation or upgrade is known to be unsafe.