It's very different across generations though - my Mum took 7 years out in 1970s/1980s to be a SAHM. She worked for NHS. When she wanted to go back to work she just wrote to the hospital, asked for some shifts and got them! That wouldn't happen now. She also went back extremely part-time, but still had final salary pension etc, and my Dad had job for life, final salary pension - he died not long into retirement but spousal pension also good.
Meanwhile, I'm mid-career, on my fifth(!!) pension scheme, none of them particularly good. I have the sort of role where if I left to be a SAHM I would stand no chance of getting back in at anything like a similar level. Maybe if I'd gone into something like nursing or teaching where there are shortages it would be easier to return but you still (rightly!) now have to update your training etc before returning.
Plus, my Mum was a terrible SAHM. She had zero patience, shouted, smacked, didn't do anything child-focused but dragged us off to see multiple elderly relatives where we had to sit in silence whilst they chatted. This left me with anxiety and lacking confidence which has taken years and a lovely DH to build up. DB and I would have been far better off in childcare.
We've spent £35k over 3.75 years on childcare). That was for an excellent nursery where staff were paid the living wage, had great training and career development (they ran it with an apprentice per room which is cheaper but I also saw the development offered to those apprentices- one was a room leader by the time we left). They did work long days (it was open 7am - 6.30pm) but tended to work 3-4 days per week.
I'd like to see the funding to be at a realistic level for the costs and spread more evenly over the preschool years. At the moment there's a cliff edge between the end of paid maternity leave and the start of the funded hours at 3. So 2-2.5 years when it's incredibly expensive. Families on some benefits get the 15 free hours from 2 so clearly there's something beneficial about it?! I'd far rather see universal 15 free (properly funded) hours from end of paid maternity leave until school starting age than the 30 hours that isn't properly funded and isn't universal. That still means paying for the rest of the childcare you need but it would make it more affordable and perhaps stop people (esp. women) having to leave work if they don't want to.