As someone who came across the ‘mental load’ cartoon pre children, I’d say it’s a much more meaningful concept when you’ve got children in the household. And gender stereotypes run much stronger, even if they’re not really there within your household they are very much there externally.
Some examples:
Any dad who turns up somewhere with a child looking bedraggled and with unbrushed hair and non matching shoes will get a reaction from general passers by of either ‘aren’t they good spending time with their children’ or ‘oooh, it’s been a tough morning’ or ‘didn’t their mum sort things before you went out’. Whereas if you do that as the mum the default response is that you’re not coping. So as the mum you carry the permanent mental load of having/making sure thats all sorted.
Ill child at nursery - they’ll call mum first. Every. Single. Time. So if your child is borderline you have to be the one with the plan. Even if that plan is to screen the call and not answer, or have a quick way of getting hold of other parent.
Whereas pre children- it was between the two of us to sort the household stuff and there was no real external expectation on who did what. Boiler broke - flick through diaries and work out who can stay in. Boiler repair person doesn’t judge which one of you is there. No dinner in the house, one of you will sort something. One of you has no clean pants, they sort it themselves and no one else makes any comments.
It’s weird, soon as you add children there’s this default expectation that the mum will make sure nothing gets missed. And you don’t like looking like a rubbish mum. So you do it.