My grandmother used to say 'pick over the beans'. I admit I've slacked off from not finding anything, but I have had pieces of what looks like a bean, but maybe darker, and I think floats,and turns out to be a piece of hard dirt. I'd say I've found more in lentils than any other bean.
Since getting an electric pressure cooker, Instant Pot, I'll never cook beans any other way-and may never open another can.
I really can't think of food documentaries besides FOK.
TV's Lidia's Italy on PBS has had many great Italian vegetable and bean dishes with good tips for preparation.
I used to make bean burgers pretty often- it's been too long now! One tip I don't see much is to let the mixture sit covered in fridge a while to chill. They're much easier to form and keep shape
Don't let the perfect be the enemy of the good