Perhaps to you, and the way you use your devices..What about those consumers (an overwhelming majority in my opinion) that love the functionality of the current iphone and IOS and just want a bigger screen to enjoy their content better ? (Browsing, app expereince, games, videos etc)..
I think the major concern for apple would be to appeal to its strongest and largest customer base rather than start to add features into future OS iterations which loose the simplicity and begin to become tough to understand and that introduces a learning curve into the entire equation. Although, i do agree with what you say in principle I feel that apple will be quite cautious when it comes to dumping capability and features into the larger form factors and future ios's that replicate an even larger number of complex PC tasks..for they would not want to alienate their largest customer base that does essentially a few things with its smartphones and/or tablets. Given the iPad's outrageous marketshare in enterprise and business i do not see much pressure comming from either android or windows hardware that will challenge apple to add a ton of features onto IOS really fast. If those systems for so much more capable and that capability was so "desirable" then apple would be loosing marketshare in the supposedly "heavy" enterprise market with its tablets...I do not see any such thing happening.
Enterprise mobile services vendor Good Technology reported that Apple's iPad accounted for more than 91 percent of enterprise tablet deployments
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http://appleinsider.com/articles/14...enterprise-tablets-ios-takes-73-share-overall
To whom will the added PC like features appeal? To the enterprise? Are they really asking them for it, or are they leaving apple and ios and heading towards competition because it offers those features? What about the normal smart_phone_tab consumer? What are that person's habbits? What PC like features does that person replace with his/her tab? Does he really want extra features that replace some of the complex PC tasks? Is he leaving apple and heading towards the competition in droves because they pocess those features?
Do the GEEKs want this? The IT folks perhaps? Sure! Are they a significant demographic that drive IOS development? Somehow i doubt it

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I am all for better mirroring, more robust PC like tasks, multi screens and what not..Provided apple does an amazing job with implementation (not like my note 3) and does so in a way that does not remove the simplicity and elegance of IOS..Their is so much you can bloat the software and overwhelm the customer with features before the entire expereince starts to go down hill. Apple has a sweet spot in my opinion that appeals to the broadest demographic...My company spent a small fortune on redoing their entire computer and IT hardware..We wanted iPhones..our CEO also wanted the same..Only reason we got handed S4's and Note3's was because T-Mobile allows wifi calling and these devices allowed them..We didnt buy them for any other feature...We also bought ipad's and did not buy galaxy tabs or any other galaxy series device. Most of my coworkers have the S4 or N3 and also use their iPhones..I see Apple doing rather well in the enterprise market at least in my industry..Most of us use the phone for a certain requirement and would be very happy if apple made those tasks even better every year..I am sure they will keep on introducing newer capability..but i see no pressure from within my industry to "desire" the sort of capability you seem to want..