Well, I guess if they're going to go forth and multiply, they're doing it in a favorable manner. A family that large will have some unique internal dynamics (aka: the creep factor). I've met about 2 families that were like The Walton's. Most were the same sibling love:loath relationships that i never got the privilege to observe from the inside. Most people have children in "a process". For some of our not so enlightened working class it's: Carnal knowledge, driver's license, steady squeeze, high school diploma, job, marriage, kids, and (probably 50:50) divorce, child support ..repeat steps 6 through 8.
For the more enlightened: Carnal knowledge, driver's license, HS diploma, college, get snagged (or snag) in either an Mrs. or Mr. degree program, start career, buy house, squeeze out pups, serve them for the next 20-25 years.
In either ..be happy or not depending on your earnest participation and integrated capabilities (harmony).
Now there are some influences that detach earnest desire and capabilities. Prohibition of contraception places the onus upon someone controlling their passions (and usually failing in spite of it) ...so it can get as complicated with all the elements needed to have a favorable outcome of such a fundamental access/choke point in the whole mix. That is, just because you're spiritually obedient in this aspect ..doesn't mean that you'll be a good parent. Go until the wife's organs give out and deal with the results
but on that "go forth and multiply" thing. How do we know that it wasn't intended as an educational suggestion?? Some would surely have been wise to pick up an abacus.