The problem with ss pin cleaning before the resize is that it won't get the primer pockets clean.
It also has a more subtle drawback with the flair process . . . When the brass is ss pin clean, the flair tends to gall the brass because it is missing the powder residue inside the case mouth - which has a little bit of a lubricating property.
I take my brass prep more seriously than most. Many will roll their eyes after reading this . . .
After a trip to the range, I vibra-tumble my brass with corn cob media first. It gets them clean enough to run through the size die, yet leaves the inside with the afore-mentioned powder residue.
After I size/decap and flair, I then wet tumble in ss pin media for a final like-new cleaning - inside-n-out, including primer pockets.
That's more work than most would bother with. I know. But after countless trials and error; that's the process that works for me.