The 'locked up' bit applies to the CEV, not healthy young people who have not faced anything like the same level of restriction.
I think it is sensible to have a plan.
Because this isn't going to be up to our government - it's not a parallel to an 'exit visa'. It's because other countries are expected to introduce vaccine-related restrictions on who can enter, and unless there is a robust system for UK residents to prove their vaccine status, then there are going to be destinations effectively closed to us, regardless of the vax status.
Is it fair that some people have been under different advice and in different circumstances through no fault of their own? No. But it's been happening unfairly to various groups throughout. Soon nearly,everyone will have had a turn