the fully integrated aspect makes a bug vulnrable in more places than just on websites.
The thing is, Windows Explorer has had its bugs also that can be exploited. The kernel has its bugs that allow it to be exploited. etc. Software vulnrabilities are everywhere, it doesn't have to be IE to be the cause of it. So to blame IE as the source of all vulnrabilities is stupid. There are thousands of exploitable vulnrabilities in Windows that have nothing to do with IE or its integration.
I feel that so long that Microsoft is not trying to prevent the installation of another browser, then there is nothing wrong. I also feel that if you really want to impose this supposidly anti-competitive reducing policy, make it apply to all OSes that come with a default web browser. Why be selective?
I can't wait for Windows to ask you 500 questions when you start up. Which shell do you want to use? Which mail client? Which browser? Which file manager? Completely disable built-in ZIP support and install WinZip? Would you like to install Photoshop instead of MS Paint? Disable built-in ISO burning capabilities and install ImgBurn or some other software? Then you have 5,000 choices of different software because everyone and their mother want to get in on the list. Then if you aren't on the list you can sue Microsoft for being anti-competitive because they selectively decided to restrict your exposure, nevermind the fact that nobody has ever heard of your product.
The EU is stepping out of line to impose this. It will also not do anything to help the consumer.