My previous landlord was amazing. Dealt with every issue that arose in a timely fashion, never raised my rent (which was already very fair based on the location), and even installed central AC after my first kid was born since the house was old and could get pretty hot in the summers.
And she wasn’t the only good landlord I’ve had.
Sorry your experience has been bad with renting, and I agree that most landlords are terrible (I’ve had plenty of those as well), but just because you haven’t ever had a good landlord doesn’t mean they don’t exist.