To be fair it always had the ability to run native executables. It just took the jailbreak community to show Apple how popular (and lucrative) it might be. I guess you can say the same thing about multi-tasking, folders, and any number of other enhancements that have been added over the years as "must have" upgrades.
Oh come on. You can't expect an OS to be released with EVERYTHING. Many Android lovers used to say how they could multitask run executables, copy paste, etc etc.
Great, but even a 2009 phone like the Motorola Droid runs out of memory all the time and maps closes. Multitasking my ass. And in the end it's not any different than some system managed multitasking like iOS. Not full blown multitasking like on Symbian or webOS.
Copy paste was a blown execution. It took HTC to upgrade it to include flags like the iPhone for it to be useful. On the Motorola Droid to copy paste in Gmail you hit SHIFT on the hard keyboard and you keep trying to select the right text until you get it. Took til when? Dec 2010 for Gingerbread to have decent copy paste? Google didn't introduce multitouch keyboards til Gingerbread also.
You're right Apple didn't include every feature on the table when the iPhone first launched in 2007. I was using Symbian already and had experienced Windows Mobile previously. How many of you actually knew smartphones that well other than Blackberries? How many smartphones had a freaking camera? Look, Apple did something new in 2007. You can't expect that it had everything out of the box.
I always say, look at Google. Look how long they took to give us 60fps animations. 2012. And what % of phones even run Jellybean right now? There you go.
We're now 6 iterations into iOS. While you might've argued Copy Paste came too late, that was 2009--before a real Android competitor was even on the board. Multitasking came in 2010, but what kind of multitasking could you do on a Motorola Droid anyway? I have one. It's not usable at all. Push notifications were implemented in 2009, and I could seemlessly get tweets, IMs, e-mails, all my notifications without multitasking. It was functionally equivalent. I think by iOS4, there was very little need to really jailbreak. The notification center was fixed by iOS5. Now we're just seeing small incremental features.
The thing that's left on the table is to revamp the homescreen maybe, and with widgets kinda being leaked into the notification bar, who knows what's next for iOS. But considering it took Android til 2011 to get a decent UI (ICS), I wouldn't really bash Apple for being "slow." Competition dictates what's slow, and unless you think Apple's gone the way of legacy BB and Symbian, I don't think you can say at all that Apple's behind the curve.