Ha, home has been traditionally always on a separate drive. That’s the reason why root user has the home under /root and not /home/root, so that it can login even if the home drive didn’t Mount.

As a curiosity, even /usr was traditionally on a separate drive and that’s why critical binaries and libraries where under /bin and /lib while all non critical stuff under /usr. It is called “split-usr”.

Nowadays /usr is always on the same drive as root, and we moved to a “merge-usr” approach where stuff under /lib and /bin is a symlink into /usr/lib and /usr/bin.

Because when HDDs where 50mb in size, even that small binary file counted as big :)

There is no problem with having home on a different disk. But why do you want swap on the slower disk? These would benefit from being on the faster disks. Same with all the system binaries.

Personally I would put as much as possible on the faster disk and mount the slower somewhere that the speed matters less. Like for photos/videos in your home dir.

/boot can be anywhere though if you are getting a grub error that suggests the UEFI firmware is finding grubs first stage but grub is having issues after that. Personally I don’t use grub anymore, systemd-boot is far simpler as it does not need to deal with legacy MBR booting.

I always put /home on a different drive than /

Mounting /home on a different device is common, shouldn’t be a problem. Universities used to mount you’re home dir off the network with nfs so that it followed you to any system you logged in to.

I believe that the only FS that absolutely need to be on the root partition are /etc and /var. The rest can be anywhere else with various degrees of tinkering. For /home to be moved, you should just need to edit your fstab (or your systemd mounts, depending on your distro).