Every child is different.
We have a very fluid set up, around my work - I have to travel a lot, in order to stay living 5 minutes from my daughter’s father. So some weeks she only goes on Tue (our fixed night) and others Sun-Thu.
She has two homes. Not a home and a house.
Both homes are fully kitted our for her. She has the freedom to move anything but tech devices between homes, though rarely does as she has everything she needs.
The styles are different - she openly giggles about mine being the Homework house, and his being the Capri Sun lunchbox house. She’s 9 and been doing this for 5 years - there’s nothing confusing about realising that your parents are different! We’re identical in one way: we both make her feel loved and secure.
It wouldn’t work for every child, but she was always very flexible before - we used to take off camping or staying with friends/family half the weekends anyway! Like a PP said, it’s like having a well used holiday home - it feels like home.
I think it’s a fair point that adults might not like swapping... but actually, if they have both homes set up how they want them, they might not mind. Last year I spent my time approx 1/2 at home, 1/4 abroad, 1/4 at my fiancé’s. Not everybody is bothered by moving around!
Actually, I’d prefer to have her 24/7.
But she loves being with both of us. She’s allowed to say if she wants to go back early / stay longer at one of her homes - she very rarely does - so I think she’s happy with the balance too.
I know all children are different - but knowing your own child is far more important than knee jerk anti-50/50 comments from those without experience.
Talk to him, OP.