It is a lot of pressure to the sole earner. Absolutely it is. I know because I did it, though not for years.
Dps company made load of people redundant at the first sniff of a pandemic. However, I would imagine the vast majority of couples discuss wether one should be a sahp or not. And it's a joint decision.
Part of that discussion should be for how long. If you are happy for your partner to be at home, is that forever? Is that till they go to school? If you are having a 2nd it's more than 4/5 years at home. So what's the plan?
And both should be prepared to change the plan. If the sole earner loses their job and can only get lower paid work, it may to be revised. If the sole earner gets a massive job opportunity, but involves travel (as an example) that needs discussion about the impact the on the one at home.
I do believe most couples, treat this as a joint endeavour. Where they are a team. Both respected. And if something isn't working both should be able to communicate that.
When the schools closed in March 2020. Me and dp, jointly decided that he would stop the search for a new job. So he could supervise my kids home schooling and go start looking again when they went back. Joint decision. I didn't lose respect for him. He didn't just stay not working. Joint decisions all the way.
In January, when the school closed, we juggled it all between us because he didn't want to give up work and then have to start looking again.
In a good relationship any set up can work.
Regarding the threads with hate regarding working mums, they were bad during the lockdowns. And, as a poster pointed out above, there's still a lot of vitriol against working parents who are still wfh and want to stay so.
They actually get quite nasty and ridiculous. People listing reasons that don't exist for having to go back. And it IS usually from posters that turn out to be sahm. One even claimed that wfh was breaking gdpr and had no concept that most companies had work from home policies before the pandemic.
But not all sahp, hate working parents. This whole issue comes down to the fact that some people are just horrible people and are nasty.
Some may just be well intentioned, but badly worded advice