I don’t think that’s what he means, see this Phoenix interview (German). No doubt his ideas are rather harsh (not the best word, but I need to leave now) though.
(Ftr, for anyone confused at this exchange – the Twitter thing was in a completely different thread.)
You don’t need to install the rest of Yast. The package manager as the biggest, most complicated part of Yast, that also needed special UI not needed for other parts of Yast is kind of an oddity in terms of development as well, iirc.