It's really interesting that dismiss a relationship where both finances and emotional support are split Equally as a 'roommate situation'.
I would say that such a transactional agreement is very roommate like. Life partners provide reciprocal support, emotionally, financially, practically. Roommates don't.
I can't decide if you have just had such a narrow experience of men that you simply cannot envisage that a good man could match your emotional and mental load contribution, or if this is actually a cynical dressing up of just wanting someone to give you money. Perhaps you have been taught to equate being given money with being loved.
My DH and I have been together a very long time
There are times when each of us had been the higher earner. There have also been times when each of us has had difficult times, health problems, bereavement etc and we have leaned on each other emotionally and practically to different extents over the years. I couldn't imagine being in a situation where emotional support was only available if you were financially providing everything, or where financial contribution is only available if someone else does all the practical and emotional support, regardless of what they are dealing with.
What happens if you had PND for example or a poorly baby and less capacity to provide emotional and practical support to your DH for a time? Does he lower his financial contribution? It's all so transactional.
I wonder if you are quite young, and have never had to navigate challenges such as poor health, redundancy, bereavement, children with SEND, unmanageable work stress. I find a lot of people can have quite black and white views until they live real life for a time.