I agree about the curveball factor.
Circa 2014, with three kids under 5, a nanny, a DH who was ‘just’ a senior associate and loads of help from my mum, mid-thirties and full of energy, it was quite doable, pretty easy and lots of chaotic fun. I even did a doctoral degree on the side.
2023- with teens and preteens, one with SEN, all 3 at different schools for valid reasons, one too anxious to travel on the bus, one at music school in London all day Saturdays, one really into golf, tutors and hobbies, endless school events, one still needing weekly OT, a housekeeper but no nanny, DH now full equity and running the team, perimenopausal fatigue, a mum with breast cancer, FIL with a degenerative neurological disorder. I’m still working in the high flying job, family life is still chaotic fun, we do just fine but we are quite often on our knees.
For us, it was so, so much easier when they were younger.