I always saw Minix3 was as a companion to the "Operating Systems: Design and Implementation 3/e by Andrew S" book which was in 2006. Probably you were only ever going to run it in a virtual machine. More of an "educational" kernel.
If you are writing this on an intel CPU, you are likely running minix3 right now.
It's not not educational, but it's not the primary goal compared to earlier versions.