I assume he refers to npm/pip/cargo to be the multiple os option, not saying the last one is obviously better for multiple os. At least that has to be because that's the only option that is os independent.

Of course it sucks because the essentially uncurated dependency trees result in either instability on updates, or missing updates. Of course also the natural OS updater won't help you out with pip/cargo/npm, but it will help with apt, yum, snap, and flatpak.