I guess mass produced nukes would rather be enriched uranium based, due to the far easier construction. No fiddly implosive lens assembly. No weird multi-phase cristallization that goes critical if you blink. Metal that is merely as dangerous and nasty as lead, magnesium or arsenic, not plutonium.
If you really want to go carpet-bombing with nukes, miniturization isn't as important as having a lot, quickly and reliably.
If you really want to go carpet-bombing with nukes, miniturization isn't as important as having a lot, quickly and reliably.