People are being realistic and honest, you just don’t want to hear it.
My husband adores me. Like nothing I could actually explain, I am the centre of his world and all he wants is to make me happy (and he does, as I do him). We have a really, truly happy marriage.
But I don’t delude myself that this means we will always be so. Look at the number of divorced couples - yes lots of them will have been in relationships that had big ups and downs, were toxic, should have never got married etc.
But lots were also blissfully happy once, and then something/things changed. Sometimes overnight, sometimes so slow that it crept in unnoticed until it was too late.
One thing that stands out so brightly in everything you post is you are so adamant about something you actually cannot be adamant about. He has wobbles about whether he wants a child. You’re dismissing it as minor, not marriage ending stuff.
It will be, unless he wakes up one day with a sudden burning desire to be a father that becomes more important to him than being a with you. You do not, and cannot, know that this will never happen.
You can know that that’s how he feels right now, in this moment. You can’t know that he will stay this way forever.
My worry is that you’re so convinced of this being a non issue for him vs his love for you that if it ever becomes this insurmountable urge for him, you’ll be absolutely blindsided because you refuse to see the possibility of it happening.
I don’t think you should have a baby with him, for the record. But I do think you should acknowledge the possibility of future issues.