If gears don't matter, why do pros use expensive stuff?

I am guessing, as I don't really know a pro photographer in person.

But it seems the although "Camera does not matter."
"Gears don't matter"

Every experienced posters who say these own the most expensive
gear. E.g. f/2.8 zooms.

So it keeps me wondering. I don't mean to say they are telling lies.
I think they have good intention. But, these posters ALL have expensive
gears.