Uninstall is a tough card to justify inclusion - assuming that you've uninstalled something because you want to install it again from scratch, you're paying two clicks, a card, plus the install cost of the original card to get where you wanted.
Except what if you could mitigate some of that cost? Say with some help from Hayley Kaplan: Universal Scholar wearing her Comet? Suddenly both the click to make the uninstall and the click to re-install come with built in second actions!
And if that second event were, say, Modded, we've done the full thing in 1 click and for three creds less than usual.
Sure, Scavenge is notably easier and possibly even cheaper for programs. The problem with Scavenge is that it can be a bit of a specific-use card, whereas all of these cards are useful for other purposes as well - they've just combined here to do what you wanted to do very efficiently. Plus this works for hardware, which is good for things like Plascrete Carapace or Dorm Computer.
Oh, and with the added bonus that being on a Blacklist won't disable the trick!