Morkus from Orkus
It was a mixed bag. People loved bounded accuracy, but many(myself included) felt that they bounded it too far and +10 would have been a better cap. People loved advantage, but many argued(accurately) that it was too easy to get advantage AND that the lack of stacking was an issue. 10 things grant advantage, not only was there not a super advantage, but one disadvantage negated everything. I don't recall any problems with proficiency itself, but I do recall expertise complaints. Arguments ensued.I remember an outpouring of love over bounded accuracy, advantage and proficiency and no brooking of argument that these were all genius.
It wasn't a kumbaya a period as you are remembering. There WAS a lot of love of the system as a whole, though, so in that regard it was kumbaya.