I don't get why so many women can't make the leap from "I want my totally lovely partner there" to "but that means every other partner there too".
Even if every man on the ward behaved nicely, you still have double the number of people wanting to use the facilities - toilets, showers, just the sheer issue of space..
And of course not every partner will be lovely. You'll get the selfish tossers who want a half hour long dump with mobile phone in hand while some poor woman whose pelvic floor is knackered after birth pees herself because the toilet is occupied. You'll get some selfish twat hogging the shower while a woman who has crapped herself (again, not that uncommon in the day or two after birth) can't clean herself up.
That's before we even get to the minority of men (but unfortunately a non-negligible minority of men) who are violent and abusive.
Expecting women to share with male strangers - because that's what other women's partners are - in open plan wards immediately after giving birth is barbaric.
We need more money invested in midwives, nurses and adequate staffing levels.