DC1 in lithotomy as almost needed an instrumental delivery
DC2 lying on my left side
With both DCs I spent the majority of labour on my left side to aid descent (although DC2 shot out after 20 mins of active labour 😳)
As a midwife I don't mind what position women want to be in, although if continuous fetal monitoring is required it can be tricky to know how the baby is doing if they themselves are in an awkward position and/or if maternal BMI is raised. Most midwives practice defensively so would want to ensure there is constant contact with the fetal heart in the presence of any risk factors. The monitors are by no means perfect and sometimes the wireless ones are more temperamental as they rely on a good signal.
Unfortunately the demands of the service expect a midwife to attend a birth whilst simultaneously documenting fetal heart (in two places), descent, maternal position, liquor colour, bladder care and more every 5 mins and takes a dim view if you get behind in these and have to fill them out after birth so it is not possible to hold the monitor in place, which is what is occasionally required to maintain contact in standing/squatting/all fours positions.
Also many colleagues have back trouble after years of hard physical work. I once caught a baby whilst in a held in a headlock by the mum 😳
I know it's no excuse not to facilitate women to be in the position that is most comfortable for them, but just wanted to add some context that it isn't always bossy midwives not 'letting' women be on all fours etc. although I appreciate there will be some instances of poor practice which is a real shame 😔