To emphasize, though, and the point I was trying to make is that it's possible (and I think likely) that both of these statements are true:

1. Long COVID is a real disease that can cause debilitating symptoms.

2. A significant number of people who claim to suffer from Long COVID actually suffer from something else.

The only thing that puts me more in the "I think #2 is a lot more prevalent than people think" camp is the astronomical amount of press that "Long COVID" has received, coupled with the fact that the majority of people in the US have been exposed to COVID, so it's easy to attribute any general feeling of being unwell (e.g. fatigue, brain fog, etc.) to the fact that you probably had COVID in the not-too-distant past.