Frontlist tracks production and platform status separately, because a paperback and an ebook of the same book are rarely at the same stage, and because what counts as "the right platform" depends entirely on the format and the book.
An ebook can be live while the paperback is still in formatting, and the audiobook hasn't started. Frontlist tracks each one on its own.
Enroll a title in KDP Select and every other ebook platform is automatically off the table until the term ends. Frontlist shows that plainly instead of you having to remember it.
Frontlist ships with a long list of real platforms already built in, organized by what they actually handle:
Sell somewhere that isn't on this list? Add it directly in the app, it shows up in the eligibility grid the same as everything else, tracked only in your account.