Why would we? Your logic is just

First of all, S&M Remix surpassed the sales of the original version in that week, Diamonds Remix didn't do it so it's fair to count Britney while it's unfair to count Kanye.

I'm a bigger Kanye stan than Britney but we all know why Kanye wasn't counted.

Kinda, but not really. And I say this as a fan. It was on its way to #1 regardless, and I'm pretty sure the solo version is more remembered.

Billboard does so why shouldn't I?

As a stan, I pretend that it doesn't exist. She sounds awful on the song. But it should. It only went #1 with the help from Britney.

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I count it as much as any feature
But when I think lead I only think of songs like 3