Should one be penalised in the relationship? I think that's actually difficult to answer. My ex did a job that he LOVED, same hours as me, had to work hard, but working with his absolute passion. I on the other hand have my passions, but didn't work in that industry because WE couldn't afford to have both of us earning under £25k a year.
As it was I earned 4 times as much as him, in a job that I didn't particularly enjoy (don't hate it my any stretch of the imagination though). As it was we had the nice house, holidays, lots of meals out all in the main paid for by me. He had lots of disposable income and we were very equal in that way. But what wasn't equal was contribution and effort.
And you know what it is draining, to see someone that supposedly loves you take it all and happily watch you work 45-50 hours a week in a mundane job, whilst they swan around indulging their passions. They could choose to relieve the burden, do a job that they don't love quite so much to bring home a little more money, but they choose not to.
So for me this thread is very focused on equality of outcomes rather than equality of input. I think if one of you is working fewer hours but picking up more at home, then fine. If you both choose to work in less well paying jobs, because you love them fine. Split according to income.
But if one of you has decided to work part time to spend more time on hobbies, or give up well paid work to follow a dream role then I don't think the obligation is on another adult to support you.