I'm full on board the "let'r rip" train, but don't knowingly expose people to sicknesses. Even if they'll get it eventually, it's better if everyone doesn't get it all at once.
The only logical explanation for testing I can fathom is to use as an excuse to get time off work and/or social approval among peers.
I have a friend at a workplace who setup a different bucket to bill time off for COVID against than regular sick days. That would be one reason.