The pingdemic is a significant threat to UK society's ordered (and not risk free) relaxation of restrictions. The chances of a fully vaccinated person being infected (compared to one not vaccinated) is less than 20%. And of that <20%, only half will be potentially infectious (ie potential for transmission (these figures from assumptions made in modelling for SAGE).
So when an NHS patient-facing nurse (say, or even one of our nation's leaders) gets pinged, is it sensible to demand self-isolation for 10 days? (I am aware that them's the rulz - but are those rules 'sensible'?) Self-isolate: get a PCR and if negative, cease self-isolation - seems a reasonable low-risk approach (and certainly less risk than several other sanctioned activities).
I do not support some cunning non-self-isolation 'study' which the PM and CoE have wisely resiled on, realising it would be a 'bad idea'. Similarly I thought the full Wembley 'study' lacked any sense of responsibility - what are the results of that study btw?