Security holes and bugs are something you never expect to encounter, but a few will still do just that.
When they patch for it, then it is because they did not see the situation beforehand and that means you will be in a situation with little to no help to get.
I think what we notice the most are the feature additions.
The first couple of versions of the bulbs had a safety feature when the power went away and then returned. They turned on at their brightest settings.
The feature update where you could decide what happend at the return of power is probably the one feature update most noticed.