Staying friends with your exes is fine and healthy. Agree or disagree?

A controversial opinion, yes, but hear me out. If it was a healthy relationship, and it ended in an ethical and emotionally stable way e. g. She doesn't want children, then you, like me, should be friends with all of your exes in the platonic sense.
Staying friends with your exes is fine and healthy. Agree or disagree?
Agree, why?
Vote A
Disagree, why?
Vote B
Best feeling: when you find out your ex has become someone else's problem 😈
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Staying friends with your exes is fine and healthy. Agree or disagree?
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