I’ve submitted the following suggestion to Apple iPad Feedback(unfortunately they do not keep the suggestions on public forum):
iPad AppStore “update all” stops if one of updates failed. It should skip failing app and continue to update others.
It also doesn’t give any feedback why update failed. There is normal software practice to show error message and provide advise how to workaround the problem.
In my case update failed for app, that I originally bought but then requested refund, as it didn’t work as expected. Ability to skip such app or suggestion to delete it will be useful.