Really appreciating all the engagement on this thread. But can I better understand the desire from yourself and some others to add apps during install rather than immediately post-install via the App Store? eg. from your perspective why would it be preferable to install something like Thunderbird during install rather than immediately after via the store along with your other needed applications? Taking aside the limited network access consideration for now. 
Having something like the tree view mentioned above risks duplicating the goals of software discoverability and management that the App Store should have.
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