It's not nonsense. Things that effect an entire family by definition affect an entire family.
A decent man's lifestyle changes significantly when his wife is pregnant.
Your obsessive literalism ignores this fact.
If something happens to my wife it happens to me. If someone insults my wife, I take it as a personal insult - he insulted us.
He may not have literally said it to me - I don't much care.
If my wife is overjoyed by something - like her mother's remission from cancer - I am overjoyed too.
Our experiences are not separable.
When Christ said that man and wife are "become one flesh" He did not mean that the bodies of husband and wife oozed into an indistinguishable mass.
But He did mean that they were one.
Would you say to Him "What is this 'one flesh' nonsense?"
It's sense.
In a spiritual sense, yes. But they don't occupy the same body.
The thing that bothers me about the whole "we are pregnant" thing is that the man is trying to equate his experience with his wife's. That is simply not so. You can try to understand, you can be supportive, some men even walk around with those silly empathy bellies. But they aren't pregnant. They don't feel the discomfort, they don't feel the same way about the baby moving, they don't give birth. They don't have the same connection. Is the connection every bit as valid? Of course. But it is different.
WE are not pregnant. The woman is. I'm sorry guys can't experience it in the same way. But it is a fact.