The problem with 2 years is that if your families don’t mesh, your kids can’t stand eachother, 2 years in is a long time to find that out. It honestly doesn’t work that way at all. And if there is a couple who are looking to expand on their family and have more kids, 2 years to introduce kids, a year to see how they get along. Another year or 2 for kids….. it’s a little much.
But to each their own. I am am not an advocate of too early, especially fresh out of a marriage. But too long can be detrimental as well.