I think this is commonplace.
I also think there's a world of difference between circumcision and what is being talked about here though. One is a permanent body alteration. The other...well, I have heard moms (keep in mind my circle of acquaintances is almost exclusively women) ripping their husbands up one side and down the other because they *didn't wipe the baby's butt right* (And I'm talking about the fold of the wipe and how one takes it out of the container, not the very real necessary front-to-back for a girl) during a diaper change. Or god forbid they put them in THE WRONG OUTFIT! Or they didn't do the bedtime routine just right. Or they picked something out of the baby food available to make dinner for the baby instead of following the written, timed instructions to a tee. And invariably these moms also complain that they never get any help. Well, listening to them trash their partners so thoroughly in front of virtual strangers, I know that I would certainly never babysit for them even though I know how to do everything 'right', I can't imagine how it would feel to have someone who's supposed to love me and with whom I created said child with treating me as if I were brainless scum for something that is so inane. :P
I think most men, unless they were raised with a lot of siblings or ones they were allowed to care for, feel awkward and unsupported in general to learning baby care. And they may be reluctant to get into a shouting match with their partners when the baby is young because they don't want to frighten the baby and they already feel like their spouse thinks they're crap. They're also adjusting to parenting as well, and it can be hard for men AND women in such an emotional, hormonal, sleep deprived time to say firmly to one's spouse, "No, I'm sorry, but I will not be treated that way," and even harder for the spouse being told that to actually hear it. If someone is calling you incompetant because you are holding the baby safely but differently, do you really think they're going to be capable of listening to you say, "gee, that hurt my feelings, can you please respect that I have a different way of doing things?" Or is it just going to mean another screaming match and even more painful distance and rejection?
I probably would have very much been a gatekeeper (it's in my nature to be controlling, I'm extremely biased towards my point of view, and if I'm made a decision on something I am right and especially if I am at a physical or emotional low point arguments are invitations for me to sharpen my claws on someone). Fortunately for me, my very wise and beloved MIL was able to talk to me gently but firmly about it. The woman is amazing, because she can be very real with you while still doing it in an disarmingly loving way.
If someone is truly gatekeeping, then it is their primary responsibility to work on changing that. If a partner is out of the house most of the day by necessity and the gatekeeper is the one home, what exactly is the outsider supposed to do? Rip a breastfeeding baby from the arms of a gatekeeping mother? Snatch the baby away and kick the SAHD out of the house as soon as the WOHM gets home? It's not quite as simple as 'do more', because getting space to be yourself as a parent also depends to some degree on your partner being willing to shut up and let you make mistakes. And there is only so much emotional abuse that I think it's human to expect someone to take before they protect themselves. (and actually, yes, I do think someone who is constantly undermining, criticizing, and dressing down their partner over outfit choices, not following the predetermined schedule for things other than medical necessities, ect. is being emotionally abusive.) In the case of abuse, I feel that of COURSE the victim has some control over what actions they can take to protect themselves, but ultimately it's the abuser that bears the most responsibility for their actions.
I think there are plenty of gatekeeprs of both genders out there. I just think that women tend to be the most noticeable because they're the ones who tend to talk and castigate their partners behind their backs to all their friends. I'm sure there's an equivalent thing that men do, I just haven't been privy to it.