There wasn't much passive about the 40 hours of contractions and 2 hours of futile attempts to push DS1 and his big knobbly back-to-back head out. After 2 births, the only bit I can't describe is crowning, but given that I felt like I was on fire from ribs to knees before the spinal block relieved me from pain for the first time in months (thanks SPD) I don't think I was missing out on much. DS1 might have been a late EMCS after all that hard work, but I still had stiches in my undercarriage from force of pushing and apparently not the ventouse. I think emerging from all of that with a baby (via HDU and NICU) is more than acceptable grounds to state that I gave birth to him.
DS2 was a "sucessful VBAC" but again born in a mad panic in an operating theatre. This time pushing with all my might and the surgeon's tugging with the forceps did pay off and he didn't have to use them to shove DS2 back up for a complex CS. I couldn't sit on a firm surface for at least a month. It wasn't any more "natural" and the only advantages were that my body happened to do it quicker so I was less exhausted. Both recoveries were long and difficult but in different ways. While DS2 used the main exit, there was no further physical experience of birth gained following DS1's EMCS. Both times I didn't feel the actual eviction stage because of the spinal blocks.
Birth is often emotive because there's often a lot of trauma attached, often but not exclusively from emergency situations. There's layers of control, consent, expectation, diginity, fear and pain wrapped up in it. It's not just physical health that matters in outcomes, it's mental too. Physical health of mothers is often minimised too. It's not that surprising that many women emerge with trauma when birth is presented as something "natural" and routine and it all spirals off on its own chaotic course.
I don't have an issue with people personally feeling like they haven't had an experience of giving birth when it's via CS, but I would have issue with someone telling me that I haven't because it's an act of minimising the process and lengthy recovery that my body went through, and neither the EMCS nor the VBAC were smooth or quick processes to go through or recover from.
I don't know why some women get competitive about parts of pregnancy/ birth/ parenting that are uncontrollable. I had a couple of people get funny with me about the debilitating effects of SPD too. Yes, pregnancy can do a fucking good impression of illness, and it's not about a lack of moral fortitude. Apply as necessary to feeding babies etc.