I agree, it is awful having the isolation issues. Most cases are still in the not yet vaccinated. Most spread between them too. There is as low as possible chance of getting ill/infected having had the vaccine but it is not zero chance. Absolutely vaccination has broken the link in hospital admissions and severity of illness.

The trouble comes for policy makers that there remains a small chance of severe illness. Although it seems unfair to have to isolate once vaccinated, it probably is just about the right call currently. Once the vaccination target is met though, I do think that will have to change. Perhaps replaced with increased lateral flow testing for the same period as isolation would have been?

Honestly the best thing we can do is encourage anyone who is swithering to get the vaccine. Vaccination is not predominantly to protect yourself but to allow the population benefit needed for rules to change.