How high?
There is a point where you hire help and this becomes moot.
Below that point, it comes to how you want to solve the finance problem as a couple IMO: if both your salaries are required, then obviously it means a full split.
Anecdotally - my wife chose to remain home and help raise our child / take care of the home and this turned out to be a force multiplier for me. I don’t think I would’ve made it to where I am, made whatever I made, built all my time sink hobbies without that decision.
It comes down to communication and being truthful to yourself Re: why do you want that job? If it is a passion, you should go for it irrespective of the earnings. If it is just an income, you’re just working for a random person instead of your own family. That’s a tough line to cross, but it worked for us with enough comms.