Because the 5BW is the anointed one.
Plus it's named the Anniversary edition, which you usually expect a bunch of badge nonsense celebrating an anniversary..
With a name like "Track Edition" you expect actual performance upgrades. I can't think of another car with the name Track in it that doesn't have any performance upgrades.
Also for the 5BW they didn't tease it like they did with the 4BW Track edition.
Teasing this as a Track Edition is like your girlfriend teasing you that for Valentines day that you get to put it in her butt, and then finding out on the big day that she just put a butt shaped sticker where the vag is.