Yes, some very valid concerns and different experiences for students depending on where they are, who they are with and how easy they find it to mix.
Having very limited social mixing means that if they don't get on with their flatmates they can have a miserable time, and can't join the societies where they would "find their tribe" - this is like the DS of a friend who is lovely but quirky and ended up in a flat full of people who just wanted to drink, throwing shot glasses out of the window, leaving the kitchen in a complete tip and he can't get away from them.
People with en suite catered accommodation who have had no opportunity to meet their bubble, for example in the Pollock hall in Edinburgh where they eat at exam tables and might not speak to anybody for days. If they have to SI, they are confined to their room with no escape for 2 weeks, with food delivered to their door like an animal.
DS's GF is OK, she is in a flat of 5 in a tier 3 city. 2 have gone home, 1 of the others is nocturnal and the other just plays FIFA all the time. It is very lonely and if she was less resilient it could break her.
It is great to see that some people have landed with a group of people they get on with and are managing to make the most of the the experience, but this is a rubbish time to be starting a degree and I think they are one of the most unlucky groups in society in terms of the influence of COVID.