This is a weird comment that, in my experience, doesn't represent the reality of today's stay-at-home parents. I'd love to see hard data on this, but let me share my anecdotes in response to the middle paragraph here. My older sister has been a stay at home mother for almost a decade, so I'll share my observations from being an uncle:
> It is normal for children to be cared for by many adults throughout the day, from birth - be they older relatives or simply members of the community.
My sister engages in a community of stay-at-home parents and homeschooling parents (there is a lot of overlap and she also homeschools) to provide her children with socialization and to also share the burden of parenting all the small ones.
By contrast, in daycare, where my sister and mother both worked professionally at different times, it is common for adults to be split between many children, usually as many as seven or eight per adult (by regulation).
> It is abnormal for one person to have to deal with all of their energy and issues.
See above
> It is normal for children to wander and play and experience a wide and varied world. It is abnormal for them to be kept in a small, unchanging indoor space.
Funny that this is an example! Many daycares are inside only or maybe have a small playground. By the time the child is 5, they're expected to sit still in actual school all day! My nephew and nieces get the pleasure of participating in something called "Forest School" where they're able to socialize with other children their age and learn about nature, shockingly, outside in nature. They're also always allowed in the backyard and have friends in their neighborhood as well. So actually from what I've seen, homeschooled kids and kids with a stay at home parent actually get _more_ outside time. It's the poor kids in day care and school that don't get to go outside.
> It is normal for new parents, especially new mothers, to be intensely supported by their community. It is abnormal for them to be left alone unsupported. It is normal for homemakers to accomplish their daily tasks communally and to be active in their communities. It is abnormal for them to endure years of social isolation, primarily spending time with their children.
Again, see above. Maybe this varies a lot by locale, but here in Texas, none of your criticisms actually apply to the community of stay at home moms and homeschoolers that I have observed in my community.