Helix has no way to get title/game for a channel that is offline
Using just helix it is impossible to get the title/status or game of a channel when it is offline.
Which makes it difficult for third party tools to obtain title/game to check it should match what we want before the channel goes live, so that notifications for the channel (email etc) have the correct game/title.
Additionally bot commands such as
"!caster - caster link to caster was last seen playing game"
are difficult to achieve using pure Helix

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This is now possible with the "Get Channel Information" Helix endpoint. Here are the docs: https://dev.twitch.tv/docs/api/reference#get-channel-information
For a list of all the endpoints added in June 2020, see this blog post: https://blog.twitch.tv/en/2020/06/18/announcing-the-latest-helix-endpoints-and-hype-train-api/
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madeira1234 commented
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Often many streamers leave short but important annonce in stream title even if stream is offline. Now there is no method in helix api to get this info.
I can get title for offline stream only with Kraken v5 (but this api marked as deprecated).