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I think you're divorcing the wording of the phrase from its common use. The expression isn't the assertion of rule that having a child at any point in life is equally wise. It's a rhetorical device intended to warn people against delaying having children indefinitely in anticipation of progressively better starting conditions. It cautions people against delaying due to unreasonable expectations or aversion to disruption.
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With any of these 1 liner phrases it can be detrimental.  The early bird catches the worm, doesn't mean you should wake up so early that you get less then 8 restful hours of sleep.  Its just gentle encouragement espousing the value of waking up early.
There is no good time to have a child is advice that makes sense in a certain context.  If you 28 years old making 80k per year, no debt, stable housing situation, plenty of disposable income etc.  You want to have a child someday, but your busy with work at the moment, you haven't traveled as much as you want to yet in life, you don't fee super mature yet, being responsible for another life is scary, etc etc.
If you want to have a kid, and you able to have a kid, but you're a bit nervous, then you will have no difficulty finding excuses to delay.
That's the context in which the phrase makes sense.  Its not meant to be a blanket statement that applies in all situation. >

∆ yeah, 1 liner phrases are dumb 
I’ll just say the impetus for this post was hearing someone say this to a close couple who is very very far from this context. I think some people don’t realize this phrase gets used even outside of the situation you’ve presented; and people really do take it seriously. >

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the phrase means "don't let perfect be the enemy of good"
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also for some there is no good time since 1-18 is underage 18-24 is poor 24-35 is career building 35-50 is increased risk of birth defects >

You are misinterpreting the phrase.  The purpose of the phrase is to call out that there will never be a perfect time in your life to start a family - there will always be some factor that needs to be corrected or some other that could/would be better in X amount of time. If you wait for the "perfect" time to have a child, you'll end up having no children at all.
It is to help people realize that the right time to start a family is when they want to start a family, not some unknown point in the future when things will be "perfect."  The goal is to encourage, not discourage. >


It is to help people realize that the right time to start a family is when they want to start a family

which is a dangerous mindset and leads to bad outcomes for children >

You seem to think the phrase means, "All times are equally good to have a child."
That's literally not what the phrase says, and I doubt there are many people who understand it that way.