I have a similar but different take on Apple being distracted and releasing these products.
Beats products still seem to be run somewhat as a separate company.
But within Apple, there aren't strict divisions by product and they seem to operate like a company much smaller than their actual size with inability to maintain multiple foci.
When the original iPhone was coming out, Apple announced they had to delay Mac OS X Leopard because they had put their engineers on iPhone.
That might have made sense at the time when iPhone was fledgling, but it seems like a trillion dollar company should have more ability to do multiple things at the same time. If you look at the number of employees they have compared to their revenues, it's a really small employee base. I think they traditionally just had one product (the Mac) and they still operate like a company that can only do much at a time. They make come out with a new product but then just move the people who made that product onto another team. With the amount of stability in the markets of both the iPhone and the Mac, they should have dedicated and separate teams doing regular updates. Although maybe the cash in the iPhone is too large to see the benefit for the Mac (plus that Tim Cook thinks the iPad will replace the Mac).
Anyhow, all that is to say I don't fault Beats for iterating, even if the iteration is Mickey Mouse. There's no reason Apple couldn't dedicate the resources to Mac development in the same way, except that it seems to against their corporate culture where it's like a school of fish all going in the same direction—and likely also that all development probably goes through the head execs and Jony Ives' very small design team rather than trusting delegation.