I mean, I didn't mean it that bad. It might be useful to actually try to implement something on an uncomplete system; and many useful things started as a research projects....

But well, on MFF UK, everyone kind of knows HelenOS is mostly a thesis-making toy OS. It exists for 15 years now and it's still that - a toy OS

(I don't know much about its internals, I was in a different section of the faculty)