Yeah, when did they get better? They've added more MSG over the last couple decades, I'm pretty sure, and kicked it up a lot when they publicized that they were re-formulating their sauce a decade or so ago—and, to be fair, they're far from alone in that, if you want a Pizza Hut pie that's about the same quality as a 1995 Pizza Hut pie, you're going to be paying more like $25 than $10 and you won't be getting it from Pizza Hut, all those chains been cutting quality and adding MSG for years to try to avoid raising prices—but haven't gotten better, except at making you regret eating it.
They already had some. Now there's a ton. And it's not to make it better, but to cover for the fact that all the other components have gotten a lot worse.