There’s no question American has degraded the AAdvantage program in the last couple of years. And there’s no question that AAdvantage was American’s unique selling proposition. They don’t have the airline operation that Delta does, or the route network (and award availability) that United has access to through Star Alliance.
Since I’ve flown American by far the most over the past 6 years I’ve watched the airline change, and mostly (although not exclusively) in ways I haven’t liked.