'Chapters' as containers are utilised by our users for more than simply novel writing. As a chapter can include changes of POV, or multiple shorter scenes, having one overarching summary is not always helpful.

If you only have one scene per chapter, then the scene summary doubles up as your chapter summary. If you have multiple scenes in a chapter, the individual scene summaries comprise the chapter's summary.
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If you are having issues with super long summaries, try to condense each summary.

Currently you need to delete chapters/scenes manually, one at a time. Done to prevent accidental mass-deletion of your content, we realise this may be frustrating to users.

You can vote on improving this feature here.