I am really laid back. The silly potty-talk never even occurred to me that people might not let their children say those things, how strange.
DS is allowed to climb on things as long as we're at home or somewhere meant for climbing like a park etc. He's been climbing stairs unsupervised since I felt he was competent - about 21 months? Whereas other parents I know still panic when their children climb stairs at 2+ - but then perhaps their children are less cautious than DS.
He's also allowed to use a (butter) knife, and use pens with me only half paying attention. He's pretty good at staying on the paper etc although he has drawn on a fair amount of his toys and books. Sometimes it's just anything to keep him quiet.
I also let him eat stuff off the floor, as long as the floor is mostly clean. I am baffled as to why some parents are so phobic about perfectly good food which has fallen on the floor for 2 seconds.
And yes getting messy. He can get as messy as he wants, if the clothes don't wash they weren't really fit for purpose. I've let him walk through puddles in normal shoes as well.
I don't insist he says sorry, but he usually does anyway. I tend to remind him to say please and thank you, but TBH again he usually says them anyway, because I've always said them to him. I don't do the witholding the thing until he says please/thank you thing.
I let him walk along on the pavement without holding hands, but I'm aware I can only do this because he's an only child (so has 100% attention) and not a bolter!
I used to let him eat whenever he was hungry but have decided to stop this now and he's eating his meals a lot better.