a person or organization that owns a room, building, or piece of land that someone else pays rent to use
You can't just make up you're own definition of words. A landlord can outsource all of that to a management company and still be a landlord.
Maintenance is work and people should be paid for work. However, the landlord will get paid regardless of who does it. Thats because "landlord" isn't work which is why "landlording" isn't a verb.