No, i don’t think so. It’s more of a rant on Prusa than it is about filament flow…
Anyway, @mowcius explained it pretty much: actual flow calibration is not yet available for the X1 as BL mentioned. Still my X1c prints with pretty good flow without any (manual) calibration from my side. And this printer sure is a step up from my other i3-styled printers, i have to agree on that.