Very well stated, and accurate. Marx and Engles born of privilege and wealth. This is much like the proponents of current day socialism, from rich families of privilege and wealth. As you said David, hardly a basis of authority and life experience to be promoting a form of government they have never experienced and know nothing about.
I know they will never do it, but I wish they could move to a country and experience first-hand what they promote. But that would require them move out of their parents’ estate, give up the financial safety net, and be under control of and for the benefit of the “state”.