To be fair asymptomatic flu spread is also a thing, although much less likely and they recommend you don’t go swimming for two weeks after having norovirus but I bet most people had never heard of the latter and nobody tests for flu unless they’re ill and we managed in the past.
I know Covid has been a big deal for you and Glastonbury was an even bigger deal in more ways than one but the truth is you can’t avoid it forever and there’s a very high likelihood when you do get it, it’ll be completely fine but probably a bit unpleasant for a few days and then replace the previous “worst thing I’ve ever had”*
I also thought that since Omicron came along, although it’s milder for most people, it’s also less likely for people to be asymptomatic. Could be wrong but I’m sure I’ve read that a few times. So people still testing themselves without symptoms probably need to be a bit careful they don’t end up falling down an OCD rabbit hole for life.
*I’m generalising there I have no idea what your medical history is.