Earlier quoted context omitted.
> lazy knight That might be possible , but is it likely? A knight is basically a medieval super-soldier: an individual with a huge amount of ongoing personal+state investment going into their ability to project power on the field. Even if they're also a feudal lord who lives within their own holdings (and therefore someone who's not beholden to anyone around them, only to a distant king) everyone working for them is…
Nope, there were a lot of fat and/or incompetent knights. I assure you.
As for incompetent knights, I'm genuinely confused: how did they survive in the role for any length of time? (Especially when the only talent pool they would have to recruit underlings from are the very same people they're oppressing. I always figured competence at protecting the outlying villages—where everyone's families live—during invasion, was kinda the reason anyone bothered to work for them at all, rather than towns responding to recruitment attempts exactly the same as invasion attempts, with stoning, boiling oil from the rooftops, etc.)