I'm torn on this. DS got into highly selective schools without much effort (some, certainly, but in no way hothoused, merely expected to do a couple of hours a week instead of nothing.)
They have 1.5 hrs homework a night at new school. He had none before. I saw a couple of teens strolling down the street yesterday, eating icecreams and laughing and had a quick pang that I am forcing him towards a much less carefree life. But actually - I don't believe I am.
To my mind, we vastly underestimate what teens are capable of, what they need to be challenged to do in order to feel worthy in our culture. I told DS he'll have to work very hard Monday to Friday in term time and play hard at weekends and in the holidays. So far he's fine with that. he loves learning. It's not always a chore to work hard. It can be fun. No harm in instilling that possibility at a young age!
Hot housing like Ruth lawrence's dad did is something else. It's the cruel manipulation of another person's life in order to make yourself feel worthy. How could she possibly thrive long term if she had no friends, no social skills, no interests beyond maths.
It's not one or the other. The best way is a balance, different for everyone, but I think most DC thrive on high expectations. DS2 is very laid back and not as overtly academic as DS1 but on the few occasions I've tiger-mummed him, he has really blossomed and his confidence has exploded. For me the key is to make sure that however hard they work, there are always fun activities each week both as a family and among friends. It's no hardship to do 2 hours homework a night if you also have sleepovers, go to the cinema, play rugby, hang out the park with mates and go for an ice-cream. That's a good, full life.