50/50 model is pretty much the one that most people and most courts go for. Eventually you won’t breastfeed and co sleep. I agree not having your kids full time is not ideal at all. But it’s also not ideal for kids to witness bad relationships or abuse between parents.

Of course there are other co parenting models. I’d consult with a lawyer to see what they think would happen should you split. I doubt courts will give him 100% custody. It’s uncommon and only happens if he can prove you commiting consistent child abuse and neglect. Him simply saying he is a better parent won’t cut it. It doesn’t work that way.