Wife works in healthcare, so I’ve done loads of LFTs, all negative. But then out of the blue the PCR at the hospital comes back positive - cross-contamination maybe? Should I accept the subsequent negative PCR and LFTs as confirmation that I don’t have the virus in my system? I don’t want to be THAT guy who spreads it unnecessarily if I do, you know?
If it was me I'd look at it like this.
You may or may not have had various covid strains over the last 2 years whether asymptomatic or not.
Presuming you are vaccinated you are about as protected as you can be from death.
Since hyper infectious (and less deadly) omicron has nearly finished burning through our population and vaccinated or boosted all it could there is not much chance that your asymptomatic or ghost infection could actually harm anyone any more.
And those that it might harm have either taken vaccines and are largely protected from death or they have had a previous infection or two with similar outcome...its no longer your problem if you are asymptomatic.
You can't lock yourself at home for a week every time a test thinks it might have found a piece of a dead virus on you.
If you're sick and test positive then sure hide away but even then everyone elses health is THEIR responsibility...not yours. (further omicron is unlikely to kill anyone even if you are sick and go out)
Anyone who you come across who is unvaccinated and you gave them omicron should be happy that you have finally given them protection against severe new strains, or a 'booster', by infecting them with a not very deadly one.
Anyone who is unvaccinated, very old and/or very comorbid well they have taken bigger risks already and made their choice...not your problem.