I experienced a similar disappointment after installing one of the Sierra security updates. It introduced some external display issues [1] which to this day have gone unfixed. I've spent hours with Apple support, both in chat and over the phone, explaining the issue and providing them with debug data. They told me multiple times it was being looked into by engineering and would continue to update me. But time and time again they would schedule a follow-up phone call that never came or tell me I'd receive an email follow-up that would never arrive.

I also echo the sentiment that it's difficult finding a practical alternative.

[1] https://apple.stackexchange.com/questions/277967/major-issue...