none of them maintain their properties

Maintenance creates Value, yes, but landlords aren’t maintenance services, they extract by far the bulk of the profits off of owning the home itself and renting it.

I’d articulate my stance slightly differently, but “handiwork” and even “property management” are real jobs that produce value, but neither of those are “being a landlord”, as evidenced by the fact that the more successful and/or lazy landlords hire managers, etc. and let the “passive income” roll in. The fact that they can outsource even the relatively small amount of labor sometimes associated with their occupation and then still profit endlessly shows that they have a very parasitic social position.