Here is the situation. There is a disconnect between how Covid was and is being handled in France as opposed to the US.. In France, almost 80% of the population is vaccinated. Therefore, hospitalizations remain low, few people are dying from it, but some form of the virus is circulating.
In my case, I'm out and about, and have symptoms that could be the virus or allergies, but when I test, I'm negative. But I could still have it but not enough to test positive because I'm vaccinated. There are probably a lot of people like me, and for most of the society it's considered endemic, something we can live with at this point. Our only rules are for visiting nursing homes, hospitals, and public transportation.And as a precaution, if I'm having an "allergy" attack, I stay away from vulnerable people and mask. However, if a variant arrives that puts a large number of people back into the hospitals and starts killing people, then we're back into a crisis instead of this endemic phase. At that point the government will re-implement the pass sanitaire (with four doses) and require masking. Nothing of that sort is expected any time soon.
So the disconnect comes with the States, requiring a test to enter,. Fewer individuals are vaccinated and protected from critical disease and hospitalization. There have been more waves of disease and death among still unvaccinated people compared to France. Meanwhile, in France, the testing centers and tents are fairly empty. People aren't required to test for most daily functions.
So here you are visiting in France, a country that is living with the virus, where the virus is often (but not always) harmless for the vaccinated, it's circulating, you inhale some particles into your nose, you're asymptomatic, you test positive, and your return is delayed.
I'm not sure if I've explained this clearly. But, the two societies are functioning differently. Few people are masked where I am in the south, but some are. I'll be masked the whole time on the train to Paris and while in Paris because I have to take a test to fly to the US, also.