I think this is a great forward-thinking feature of iOS. Some apps I have are no longer available via the app store. The only way I can retain access to them is via local copies.
If an app is "completely gone", it probably has a good reason not to be there in the vast majority of cases.
Cold comfort to those who paid for said app.
So want to take away my right for the app I legitimately purchased and downloaded to my PC for later installation ? This cloud BS has really taken its toll.