Haiku is really lightweight and a great OS to work with.
I installed it on my thinkpad. It went well except it could not find the boot loader. Had to install rEFInd to enable UEFI booting. Then had to copy files from the system folders to load on to the bootloader. Some geeky stuff, but it was worth it in the end.
This thing is blazingly fast and very productive. We get R, Python, Node, Rust, Tex, you have it.
It does not have pandoc, but that's something we can build.