I think we first need to establish Tom means repeats, as in first / second ending kind, or simply as a repeat using the BIAB "number of choruses"
Neither. There's only one kind of repeat.
These form markers are present for every song, unless you disable them by Preferences | Display. These are not the type of repeats/endings we’re referring to here however. The repeats/endings we are talking about now occur during the form, and are the 1st/2nd endings, DS al Coda and other repeat types that you see on a typical lead sheet.
Wrong on both counts.
1. The form markers enclose a part that is to be repeated. That
is a repeat.
2. 1st/2nd endings etc. are navigation instructions, not repeats. You can have DS al coda without a repeat. Repeat means repeat.