It does worry me a lot what will happen if they do ban birth partners full stop. It seems staff will be a lot more stretched without having birthing partners to support with the less medical tasks (eg reassuring Mum, fetching things she needs etc) and I imagine would struggle to get around everyone in the same depth.
Even before this happened, I know visitors were heavily relied upon to provide other elements of care. For instance when my Nan was in hospital, a packaged sandwich would be left on the table next to her bed. At that time she was far too weak to reach across and open it herself, so unless someone visited at meal times to help feed her, she would not eat all day, which would make her weaker and have a knock on effect on the infection she was battling.
For those in too much pain in labour to communicate with medical staff or alert them if something is wrong and has gone unnoticed, sadly the consequences could end up being fatal.