There was a fair bit of material in the comments, including people disputing the claim, or questioning what "barbaric" even means. Plus some asking why Firestone was devaluing the one thing only women can do. But also a lot of women saying "it's great pregnancy is fun for some women, but dear god I'd love an exowomb rather than shitting out a pumpkin with permanent changes to my health."

As for singling out pregnancy, I infer that Firestone had a thesis of how pregnancy was a keystone of the social subjugation of women. Everyone shits, only women spend nine months dueling their fetus for control of their bone calcium, so you've got both specialization and intensity, vs. something everyone does which isn't that big a deal.

As apparently a radical rather than liberal feminist, she apparently had extreme positions of "pregnancy is treachery", while the pro-exowomb commenters said "of course no one should be forced to use one".