I don't know. I think it should be a discussion between you both as parents, taking into account all the circumstances.
We ff our first, alternated the nights, took equal time off work etc. The result is a baby (and now child) that bonded with us equally.
Our second we tried to mix feed, but baby refused bottles so I EBF. Bear in mind that my husband this time took more time off than me, and is fully involved in every aspect of parenting, nappies, slingy walks, pacing the house, everything that wasn't feeding, and baby bonded far more with me. He has tried repeatedly but it's taken until she's gone 2 that she'll sometimes accept him at night wakes.
If he wants to give the odd bottles, and then disappear off to the spare room, then I say jog on. He didn't just hey to cherry pick the nicer bits! But if he wants to be equally involved, give a bottle at night so you can sleep more, AND does the majority of baby care and admin (plus house chores) when he's home, then I think mix feeding is a more reasonable request.
But surely all this should be a discussion now either of your making demands, or taking about rights. It's about what is best for your family.