I think this feature could be very interesting for Families where one poor admin is managing multiple computers of family members.

Here the family members can install applications themselves (the admin does not manage the PC like an admin in a company).
And family members might have turned off the PC for some days (not always turned on).
So such a list would be very very helpful.

But you get the point (what I mean) and can find a proper solution.

Added the colour contrast for the white exclamation mark on red background (on page "Hosts)

We do, we just didn't get around to that yet. We have a long list of stuff to do before we make that 😉