We are saying that one partner at home (man or women) should be considered a valid life choice if both parties want it.
That's literally what most people on this thread have been saying, the key part there is that BOTH people want it.
Unfortunately minority of posters seem to have spent most of the their thread contributions arguing that people hate on SAHP, don't value SAHP, that MN is an area where nobody supports SAHP, with a healthy side order of stupid comments about working mums being on the hamster wheel, snide comments about people's CV, high fliers, and the rest (all whilst hilariously claiming to be supportive of women, but there we go).
It's all well and good people saying money was tight for them but it was worth it, or they're a SAHP and their husband is totally on board and it was agreed before they had kids, but that isn't the OP's situation.
If OP and DH went into having children with a view of both parents working in some capacity, then wanting to be a SAHP after baby has arrived and wanting the partner to be a breadwinner is a substantial change. If OP's husband doesn't want to be a breadwinner, it's totally irrelevant that someone else's husband agreed to be a breadwinner before having kids.
If finances would be tight, not everyone wants their household finances to be tight, let alone be tight whilst having the sole financial responsibility for the family unit. It's irrelevant if someone else says finances were tight but they didn't mind and it was right for them, their DP, and family, because not everyone wants that to be their position.
Pointing out that both people need to be on board before making substantial changes to the financial situation of a family unit in the short, medium and long term is not some vendetta against SAHP. It is common sense.