Agree with your assessment. I've got a 2021 Sierra that will not retain equalizer bass/treble or balance/fade speaker settings. Brought it to the attention of the dealer a week after purchase and was told "there are problems with 2020 and 2021 infotainment systems that we're waiting for a software update to fix." The dealer (and GM) know there's a problem and it's been over a year with no resolution. Not acceptable by any reasonable standard, especially for a vehicle costing in excess of $50K. When I take my truck in for it's first oil change, I'm demanding they replace the infotainment head unit under warranty. If they refuse, I'm letting them know I'm driving my last GM truck.