
To be fair to them, and having worked in the software dev industry for many years, I completely understand the reasoning & thinking that will have gone behind the decision to release this update. There's a difference between shipping a bug where you can't reproduce it reliably and you suspect the impact is limited vs. just pushing out a known showstopper issue. It was a judgement call which in this case was the wrong call, and we all like to focus on the negative while we forget the much larger number of smooth updates where there are few tangible issues. It's a mistake, pure and simple, and hopefully they can learn from it.
I think anyone who upgrades immediately without waiting a little while to see if there are issues is also a bit naive and Abobe are far from the only company who have problems with new releases. Apple, Microsoft, Google... everyone does it, we just don't remember the times where it works perfectly.