You're a little off base with the effect AMF had on HD. AMF bought into a company that had been bled for every penny by the Davidson family. In the 60's Harley was building bikes in a 5 story building. There was no assembly line, and bikes made trips up and down the elevator from start to finish. AMF invested huge amounts of cash into Harley Davidson. They upgraded production lines and fed lots of money into product development. The bikes that were being produced (Shovelheads) were top notch 1936 technology, assembled by a staff that portrayed every assembly line stereotype there is. There was absolutely a difference between a Monday bike and a Friday bike. My dad worked at a dealer for those years. Some bikes suffered from such poor casting that they had to be torn down and have the cases and heads painted to keep them from oozing oil through the metal.
While that was going on, AMF was working with Porsche to develop the Evolution engine, which went on to be revered by many as the engine that saved the company.
AMF also hired Willie G Davidson as a designer. He tried to diversify the company with bikes like the 71 Super Glide (boat tail), and the XLCR Sportster. Both bikes were considered flops, but the Super Glide went on to be a huge success story. The XLCR frame carried over into the Sportster that sold until 2003.
Harley needed a scapegoat to dump the terrible business decisions of the previous 40 years on, and they couldn't disgrace the Davidson family name, so AMF took the hit. Meanwhile, the developments that the employee owned version of the company succeeded on were all accomplished with AMF money.
Too bad they didn't learn from any of those mistakes.