You've not read anything Marx wrote. So you wouldn't know.
You weren't even aware of the basics, like industrial armies, and such. You claimed that wasn't part of Marx's vision, yet it's flat out explicitly stated in the most basic of all Communist documents. And, you thought Das Kapital described Marx's view of a Communist society. Maybe read some of the texts - or at least one of them - before commenting.
Marx and Engels wanted to abolish all right of inheritance, to end home and religious education, to dissolve monogamy in marriage, to pursue extra-marital sex, to nationalize all housework, to shift mothers into factories, to move children into daycare nurseries, to separate children into community collectives apart from their natural parents, and, most of all, for society and the state to rear and educate children. "The Origins of the Family," by Engels (in the introduction, Engels credits Marx - Engels put the book together using various extracts of writings of Marx before he died), and Marx and Engels' joint work "The German Ideology" (published posthumously).
Engels wrote, “the single family ceases to be the economic unit of society. Private housekeeping is transformed into a social industry. The care and education of the children becomes a public affair; society looks after all children alike....”
Marx's list of about 10 points toward abolishing private property, private lending, private transportation, private communications, inheritance, the family, etc. -- he concedes in the Communist Manifesto itself - “Of course, in the beginning, this cannot be effected except by means of despotic inroads.” His plan cannot be effected except by means of "despotic inroads." That's his vision. Part of that vision is to eliminate the family, and raise children as a community - and that makes perfect sense under communism. If you have a family, then some families will be better than others, more caring than others, more competent than others, and manage resources better than others. If you have children raised in common by the State, then they can level all the influences, and the children will be raised equally.
This is basic stuff.