As you type in an email address, the domain appears in the location field. (You can still type something into the location field if you want to override it.) There's no need to choose "CalDAV" or "ICS" as in the current dialog; it is automatically detected.
Bug 306495 Comment 61 Edit History
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As you type in an email address, the domain appears in the location field. (You can still type something into the location field if you want to override it.) There's no need to choose "CalDAV" or "ICS" as in the current dialog; it is automatically detected. If you check the box for "doesn't require credentials" the username, password, and "use password manager" rows are immediately hidden.