You still didn’t answer the question.

Actually, I think I did, you just didn't understand it. What we mean by 'landlord' can be essentially boiled down to 'private ownership'. The problem with landlords as a class is that they exert complete control over a 'property' while having the least use of it. When Adam Smith wrote about 'rent extraction', he was specifically identifying a portion of an economy that was unproductive.

Landlords are defined by their ownership; they could also maintain the property, but what makes them 'landlords' and not 'maintinence workers' is their ownership over a property someone else is using and charging rent for that use. The other arrangements I listed in my previous comment address that inefficiency by democratizing the use of that asset, instead of allowing the monopoly of the landlord.

It’s odd to observe otherwise intelligent people stop so outrageously short of the complete picture.

I would really have to agree.