I don't think the execution failures are specific to them. They were having to sustain an existing business, plus do accelerated development of a new platform

I don't think the execution failures are specific to them. They were having to sustain an existing business, plus do accelerated development of a new platform and devices, plus the core apps and libraries on top of that, starting from a laggard position with the competitors having a several year head start, and all the time spent doing this the competitors continue to move ahead. I'd expect the majority of companies to fail at trying to pull that off. Much of it is the kind of work where adding more people will be of no benefit. The surprise isn't that they failed - it is that anyone expected them to succeed!