As someone who was both a LL and tenant at the same time I can tell you that if 90% of small LLs are fine they would not be hitting the exit button like they have been.
Now for balance of power. When I was renting the LL gave me notice to sell. It was starting to get really difficult to find anywhere and when your circumstances are not secure its not a great feeling but this "home" idea is nonsense. I never thought of the rented property as my home. I like many had rented my home out to tenants and moved. These were long term rentals also. These emotive matters are not simple.
Now when i needed to sell my rented house (previous home) the tenants (on 60% below market) overheld and stopped paying the rent. As a LL I can tell you "try it sometime". I didnt do that to my LL who didnt give me correct/any formal notice etc, but so what.... when I needed a few week a the end, he was sound about it. (again no need for rtb)
The rtb and the gov made things bad for me as a renter coz LL sold maybe on advice of colleagues and friends etc with things changing so fast and screwed me as LL so no one wins here. I would say that when this was happening I would feel from a vulnerability perspective there is not much in it between a LL and a tenant. If I had to push it it was worse as a LL. Things were so much better before the gov got involved. - and I was only a renter for most of that and main thing was trying to get the deposit back.
I assume he means that "90%" most LLs are good landlords. Not that they are fine as in happy.