Thats still a long commute to a uni in London. We are just over 30 mins out - not what most students at mainstream unis want.
Its a choice all Londoners make, and indeed presumably people in other cities. As I said upthread DS chose to share an ex-council flat 10-15 minutes walk from his University. The downside was no living room, but he used the 24 hour library instead. Others will pay less on rent, put up with a commute and live somewhere more comfortable. DD planned to live at home and cycle to Imperial, though lockdown put paid to the need to commute further than the kitchen from her bedroom.
London kids are used to commuting. DD had a 40 minute journey to school which was pretty standard. They are also adept at getting home from parties. ("Mum where is Erith?") It will have been very different for your daughters, who boarded so will have had everything on site. To them 30 minutes presumably would have been quite a shock.
Other Universities are no better. Bristol's student accommodation at Stoke Bishop is some way from the University with few of the shop/restaurant/transport options available in London. It is hilly so cycling is difficult and the University warned students not to walk home over the downs at night. Richer students will use taxis but this is not an option for all.
There is a real MN downer on London, despite other posters regularly contributing to say that their DC are really enjoying being in the city, have been able to make it work, and were receiving a world class education. I think the point is that your DC may have been unhappy, despite the advantage of the use of mummy and daddy's flat, but this does not mean all London students struggle. Going back a long time, but my own experience was that experience of student life in London and the resilience it required, was a huge advantage when starting work.