For me, the quarantine is welcome. My wife went home to Russia to visit relatives just before they closed everything down. She is stranded there. She is safe, but obviously wants to get home and I want her home too. 14 days quarantine with a verifiable UK address is what I have. It may just be the mechanism by which I will get her home.
For all measures about prevention, of course we can pontificate but essentially none knew how this was going to pan out. I do think that the 14 day quarantine would make sense if they instituted it the day they made the Stay at Home instruction.