the rest will probably never get a firmware update, it's too risky.
Amen
Do many others echo this thought? I am interested in knowing if updates have really been a pain in the past, if so I will also go with the "If it ain't broke, don't fix it" approach for my own mine.
Most firmware updates from reputable companies have a change list and give you a clear idea that it's had some quality control testing. And in those cases even they usually only recommend to flash new firmware when there is a problem or clear bug.
With Bitmain it's different, they toss out whatever code wise, often reportedly violating code licenses and not listing a changelog, and then they try to clean up the mess afterwards. So with this particular company I'd say it's much safer to not update your firmware unless you have a major known problem that you are fixing.