I don't think that's fair. I work in software and sometimes bugs are incredibly hard to recreate and from what Steve posted a while ago it took he and Charles 5 hours to find the cause, meaning it was an absolute pig to find because of the rarity of it occurring. They may well have tried to replicate it when it was first reported, couldn't due to lack of info ("x doesn't work" with no supporting detailed information is unfortunately the norm), and other more important things pushed it way down the list. The difference here it appears is they saw it themselves and then managed to track it down.
Software is complicated, I have 20+ years experience and I still ship stuff with bugs because, well, deadlines. I appreciate that they take their time and get it right, it's a rare thing in this industry.
MMM