I'd guess a large majority of household with a sahp probably fall somewhere in between? for that matter, where both parents work outside the home, they probably do too.

the bottom line for me is that I don't think it's a good idea for either partner to have sole control to the extent the other wouldn't know or understand what's going on if they needed to.
and it certainly doesn't sit right with me for a partner to have to ask permission for every little expenditure. and I'm not saying that's necessarily the case with the OP of the ml post, just that I've known more couples than I'd like to where that seems to be how they function.