So you're saying we should significantly alter our society for the worse, possibly forever, "just in case". For a theoretical threat which does not actually exist at the moment.
That, is irrational, particularly when the threat from Covid even if vaccines topped working altogether, is not catastrophic anyway (199 out of 200 survive....).
BTW, Test & Trace can never work, even the Germans have discovered that It is a waste of money:
1 - People do not want to spend up to 2 weeks in their house. That's a given, so people have to be very motivated to do that, even if they are paid to do so, unless it is an obscene amount of money
2 - People are even less likely to want to self isolate if they only have a 1 in 50 (or whatever) chance of having Covid because they have, apparently, been in contact with someone infected.
3 - Because of the vaccine people know them spreading Covid is very unlikely to kill anyone, so they do not even have the altruistic motivation for self isolating.
4 - Even being tested, an essential starting point of T&T is becoming less used. I was speaking to someone who went for a test and it was empty. If I knew I'd be told to self isolate, and possibly shut my business because my staff (having been in contact with me) would also have to self isolate, quite simply I would not take a test. And my staff have also said the same thing. None of it is necessary anyway, because we have all had the vaccine.