Another aspect of this is that, unlike third party saturation plugins, you can't use ChromaGlow outside Logic. It's thus another way to keep people locked into Logic, and hence Apple hardware and upgrades thereof.
That's not necessarily a net negative; ChromaGlow has the appealing "it's free" feature. And it will gain some benefits from integration of Logic, such as visibility of .aupreset settings in the Library browser. But all these Logic-native plugins and features come with a subtle loss of platform freedom.