I partially agree with the OP and partially with the Apple's motive,but many phones were left behind in that linearity....Nokia,Palm,etc..All of them didn't kept up and eventually lost,I AM NOT talking about ability to customize but actually give users bit more feature-ful experience in their smooth enviroment like developing APIs so that apps can mutually interact with each other more coherently,A good all in one file manager,they can retain their home-button while introducing a touch gesture aswell for the switcher/going back to HS,actionable notifications,these are just examples...
I find it funny people are always like "I am fine with it,No issues so I don't think Apple needs this"...No one needed Touch-screen before Apple?? I guess NO...so in people were fine with gingerbread,Crackberrians are fine with their BB's,EVERYONE seemed fine back in 2006 with their razr....
I am sure when sms first came out people would have a lot of trouble typing texts,It would be a sort of new experience for them to type via digital buttons and atleast they were not be able to atleast connect their emotions to the typing experience (this is same as many people FEEL good while reading hard-copy rather than digital),So it is not so alien to give users some features AS the OS matures,and please IT wouldn't hurt anyone,IT WOULDN'T spoil the usual sleek experience,everything would be clear,icons on HS and their settings on Settings app...Like ok Apple won't likely ever open up the keyboard API because it can include potential security risks,but there is a lot of potential for the OS,it is about time before Android catches up with iOS's speed,fluidity and productivity,Not because of customizing things,THOUGH not in security and Ease of use...WP8.1 looks promising with regards to features given...A void remain b/w,with a "completely open source experience (NO security No nothing Whatsoever or) or half baked experience (BB) with security and features but No stability/Progressiveness" on one end and on the other end we have A premature Locked-in OS struggling to get his name (WP8) and a pretty mature and miles ahead OS,but extremely limited to ITS potential...So Apple really has a chance to speed up their game