If you like innovation, you should welcome antitrust scrutiny of major players such as Apple. Apple's approach to doing business has benefits, but there are clear anticompetitive downsides. Excessive lock-in, tying arrangements, and the like harm Apple's counterparts, competitors, and customers. For example, the European Union has correctly determined that the benefits of Apple's App Store (security, ease of use, etc.) can exist alongside alternative app distribution models that Apple does not control. Similarly, while Apple's customers benefit from the close connection between the Apple Watch and iPhone, they would benefit even more if there were no technical impediments to, say, Android developers creating integrations with the Apple Watch.
Antitrust law also recognizes that anticompetitive conduct becomes more problematic as a company becomes larger and gains more marketplace control. A "walled garden" can have high and possibly impenetrable walls in a growth situation, but not when the company gains outsized market control.
Apple as we know it today would make it nearly impossible for a new Apple to compete. Left alone, it also would have increasingly little incentive to innovate.