Of course I am. I don't like the "Even in a modern context". That statement papers over all the details that show why the statement is useless as a means to understand the modern context. My hypotheticals are examples of how that view cannot be applied to many modern contexts.

You complain about hypotheticals. This whole tangent started with the hypothetical "if she would otherwise be idle" so it isn't like I started it. But you'll see that I also gave a non-hypothetical. My wife doesn't work. I do. She goes to school full-time and gets disability money from the army. Should she do all of the household chores because I'm the one who is earning the money? Maybe. If she wants to. But it's not predicated on that I'm the one making the money and she isn't.

The disagreement between me and others here seems to be because there are two issues at play: one is the personal view of the commenter, regarding what that commenter expects from a relationship, and the other the extension of that view to others.

The former I find somewhat crude and distasteful but acceptable because breaking up or getting a divorce has much less of a stigma than 100 years ago. It's the expansion of that view as a generally acceptable cultural goal or justification that I'm complaining about.

I mentioned "chores will be distributed inversely proportional to % of household income provided" as an example how the commenter's view is not a useful guideline. The view is absolute: if the girlfriend doesn't work then she should spend not more than 20 hours a week doing chores. My question - meant to highlight the useless of that guideline - is: if the girlfriend works for 1 hour a month, does that mean she doesn't need to do any chores? Almost certainly not. But the guideline says nothing about how to handle that case, which means it's a rather overly specific guideline.

(Now excuse me. I need to put the next load of wash on the line. It's my turn to do laundry. :) )

I really don't understand your point. Different households are always going to have different arrangements regards things like chores.

I don't think the original comment said anything along the lines of "here is an equation that everyone needs to apply in order to decide who does the dishes".

Just that if you have a situation where one person has significantly more free time than the other it wouldn't seem unreasonable to expect them to do more chores. Of course in real life there can always extra variables that complicate things. These things usually manifest themselves as domestic arguments, so are best discussed up front.