We had the recalls on our 2019 Ascent completed around the first of the year (transmission firmware and sensor, ECU firmware). The car went from annoying to drive to undrivable in certain situations. It now loses power slowing down by ~5 mph (especially going uphill), then surges 10 mph (nice and dangerous in the snow here), the cruise control struggles to maintain speed on flat roads (prior to "fix" this was not a issue), the transmission seems to slip into neutral at times (revs stay the same or increase but car slows 5 mph) then surges. Of course the faux shift shudder & shake has returned, it did go away for a bit after the recall. The only thing the recall seemed to improve was the sporadic squealing from the CVT. Prior to recall we had no issue with surging, only loss of power and inconsistent violent shaking during the faux shift.
I would be curious what other 2019 Ascent owners are experiencing post recall.