Coverage chart / Battle.net
Floodtide does not update Battle.net
Homebrew carries Battle.net, but publishes it without a checksum. Rather than leave you to find that out after paying, here is the whole reason.
Why not
Battle.net is served from a single unversioned URL that always points at the newest build, so Homebrew cannot record a checksum for any particular release. Floodtide will not install a download it cannot verify against a published hash, because the verification is the entire point of letting it touch your applications folder. Covering Battle.net would mean fetching whatever that URL happened to return and hoping.
Battle.net keeps itself up to date on its own, which is why its download works this way.
Floodtide also reads the Sparkle feed of any installed app that publishes one, which is a separate path from the Homebrew list. If Battle.net ships a Sparkle feed on your Mac, it will appear in your update list even though it is not on the coverage chart.
What this says about the rest
MacUpdater kept a hand-maintained database of every Mac app, which is why it could claim near total coverage right up until the day it could not maintain it any more. Floodtide reads sources the vendors already keep current, so the coverage list is smaller and it does not go stale. The trade is deliberate: a shorter list you can trust beats a longer one you cannot check.
Questions about Battle.net
Does Floodtide update Battle.net?
No. Homebrew carries Battle.net, but publishes it without a checksum. Battle.net is served from a single unversioned URL that always points at the newest build, so Homebrew cannot record a checksum for any particular release. Floodtide will not install a download it cannot verify against a published hash, because the verification is the entire point of letting it touch your applications folder. Covering Battle.net would mean fetching whatever that URL happened to return and hoping.
Will Floodtide ever cover Battle.net?
If the way Battle.net is published changes so that a verifiable version becomes readable, it appears in the coverage list automatically. The list is rebuilt from the live source, so nothing has to be added by hand.
Does Floodtide hide apps it cannot update?
No. Floodtide shows an app it cannot handle with the reason attached, in the app and here. An updater that quietly omits what it cannot do is one you cannot use to answer the question "is this Mac up to date", which is the only question that matters.