Helpful would be a kind of page status beside
drafts. Drafts is actually something different than
unlisted. Are drafts not unlisted as well ? :-)
Possible values could be
ready to translate,
ready to release,
locked and maybe some others (a kind of publishing workflow). It also would be a big thing for different language versions. Currently a page cannot be a
draft in english and
listed in german, which is very bad when viewed from a workflow or translation perspective (see my suggestion: https://kirby.nolt.io/150). But I guess it is a bigger effort in kirby, right?
Imho the team has to decide if this is a major feature for the core or if you could do this probably with a plugin. As far as I see there is no workflow Kirby plugin outside doing this. I would definitely make use of it if there is something. As soon as you work with several people on a page this is indispensable.