It’s the whole point. In the vast majority of cases an artist’s highest sales week is the first week. It’s just basic logic that a debut should outsell week 24.
Not if they've never sold that amount before. You can't just expect an artist to do numbers they never did prior just because.
I’ll give you X since that was so close to what Missy sold (although slightly more, right?). Add that to the Britney debut week. That’s 2 examples. 169 and less than 200 were significantly more than what Missy did.
So two weeks out of 52. Any more examples?
The whole point of it is that even in 1999 when albums were doing 650K in a week, 130K or even less (since Britney started the year off at #1 with 121K) was enough to score a #1 debut. Even the article stated that in normal times. Britney's 121K got her a #1 because there wasn't really competition THAT week. Same goes for X. Same goes for the Santanna numbers. When Missy's album came out, she was out here against a Limp Bizkit album that was did 650K in a week and a slew of albums that were still doing what many artists were doing in week 1 after being out for months. Shania Twain was still in the Top 10 with an album that came out in 1997 until that week.