Ugh, people seem to have a very short memory. Aperture started stagnating under Steve Jobs, he was also the one who thought mobile me was an idea and the one who stuck to smaller screen sizes for iPhones. Jobs was great for imagining and reimagining new products and new product categories, something that isn't needed here. Moreover, it's quite obvious to me that Apple has revitalized their OS X efforts after Jobs passed away. The redesign of iOS would not have happened this way if Jobs were still alive. We can argue whether their efforts were successful, but IMO they have done a lot to improve OS X over the last few years. Part of the problem is that OS X and iOS are moving too fast, so that the balance tips too far in the direction of new features rather than polish and stability.
To say that Cook lacks a vision is patently false, his vision for Apple is very clear. Maybe you disagree about the direction Apple is headed, but I don't think Apple is missing vision, they're hiring the right people and worry about the correct issues in my opinion. I have yet to see a sign that Cook is trying to be the arbiter of good taste that Jobs was. He knows he is no Steve Jobs and leaves that to others. The problem is execution, not the vision.
The eternal complaint about Apple's »consumer focus«, I've heard that in 1997 for the first time. It's as misguided then as it was now. Are people who use an iPhone for work consumers? Or who primarily write work e-mails and texts for a living? The distinction between »consumers« and »professionals« has become completely meaningless because nearly everybody uses a computer to earn their living.
You no longer need the most powerful computer to lay out text or edit photos, every entry-level computer and even the iPad can do that, in real time. Computing has become ever more mainstream, and Apple, Microsoft and Google are currently reacting to people having more than one computing device. This is where they put their resources. Microsoft's attempt is to put Windows 10 everywhere, from the humble Raspberry Pi 2 to big servers. They believe that certain devices can have two personalities (e. g. tablet and regular PC once it is docked). Apple thinks that Continuity features plus the cloud are the answer, but that the OSes should be kept separate. Google wants you to put all of your data and apps in the cloud. It doesn't matter whether you pick up the phone on your Mac or your iPhone. Once you understand this, it's also clear that Apple has no intention of loosing track of the Mac, it needs OS X are part of the continuum of computing devices. And new device categories can be added to this continuum (e. g. Apple Watch or a redesigned Apple TV).
I don't think these companies are moving at a faster pace than Apple, and they have had significantly more failures in recent history than Apple. Microsoft had Windows 8, despised by most of the user base, and a phone operating system which still has negligible market share. They had a serious write off of Windows RT (which has also been canned). Google had Google+. Adobe's user base for the most part hates Adobe's new subscription model where many users say that they can pry their copy of CS6 or Lightroom 5 from their cold dead hands (just have a look around the forum here). Amazon built a premium phone that only few tens of thousands of people bought. Most of these companies still do very well financially (not as well as Apple), but to just say the grass is greener on the other side seems myopic.