I don't want integration. I prefer not to put all my eggs in one basket, simply out of cussedness. I use Ubuntu, Windows, Android. I don't use any of the same apps on any of the OS. Exception is Startpage and Duck duck go which you can get to in any browser. It's more work,since if I wish to use Yahoo mail I must use the browser, and change the browser to standard mode, but it adds to the satisfaction.
I buy from Amazon - but no ebooks, won't use App store. If I want ebooks, there are independents. I'm waiting to see what happens in the price fixing suit. The suit was brought against Apple and publishers, and they might lose - so we'll see how prices go.
Ebook price-fixing: judge approves settlement with publishers | Books | guardian.co.uk