I had two points. First, you weren't responding to the argument that you quoted. Second, the premise that a lack of third-party browsers justified an (or the) investigation is flawed.What point are you trying to make here?
As we've discussed before, the push for regulations to specifically target various aspects of Apple's business model isn't about Apple doing something wrong. It's about people and businesses wanting Apple to be forced to support their preferences. Nothing wrong with that in general. Regulations are necessary. I just disagree with the focus of certain regulations and proposals.
For example, on the topic of browser engines, I have no problem with third-party web browsers being able to use their own browser engine. That makes sense as competition for Safari. However, I would be against any regulation that allows other third-party apps to bundle or access other browser engines, because it would lead to bloated apps and cross-platform interfaces that devalue the platform. Just like we see happening on the Mac.