On that last point, I think it's important to address some conflation that tends to happen in that area. The thing is, capacity for strength is not necessarily a general trait of men. It is, however, a general trait of people who are assigned male at birth, or AMAB (you could also say biologically male or such, but I personally prefer the terms AMAB or AFAB because they imply less of something being the "normal" gender for a person. Not to mention that biological sex is, like many things, not just a binary).
So since most AMAB people will go on to retain that gender identity, people tend to conflate that physical trait with men, even though men can be AFAB. Gender is an invented concept separate from such things, so really all gender roles are arbitrary, even if some come from a more observable basis.
I don't know how much sense that made, but I hope it helps. Anyway, I should really sleep...