Couldn't have said it better myself, but I'm going to try anyway! đ I realise this thread is in the iPad section of the forum but a Google search for "macbook air forward delete" brought it up as the second result, so here goes.
Anyone that thinks this key is not useful is, IMHO, an arrogant Macophile that blindly refuses to look outside the little Apple-created box that they live their entire lives within. Which is 99% of Mac/iPhone/iPad users in my experience. Plus as the OP said, I can't understand why on Earth these people have never, ever felt the need to forward delete instead of using the right arrow key and Backspace...this just absolutely boggles my mind!! I guess you don't miss what you've never had, but still, I'm sure these people can see the sense in making x key presses instead of 2x key presses, especially when x is 10 or more! Sure, you can use the mouse to reposition the insertion point and then Backspace, but I find this to be just as tedious.
So I've been happily using Windows only on my Macbook Air for the past 2 years (installed it natively via UEFI and completely wiped OS X) and haven't had a single problem. Now I'm in my 3rd year of a B. Comp. Sci. degree and my tutors have told me that they refuse to mark my work in Windows. They are obviously part of that group of Macophiles that I mentioned earlier. So I went through 3 days of **** to backup my data, reinstall Mac OS X via Internet Recovery (I must admit that is one Apple feature that I absolutely love!) and attempt to install Windows via Boot Camp. I couldn't get the Windows install to work for god-only-knows what reason, and eventually gave up.
So now I'm really trying my hardest to get used to OS X and make it my one-and-only OS of use. But things like this forward delete business, automatically sleeping when I close the lid and many other little annoyances are making it extremely difficult. Yes, they are all trivial little things on their own, but add them all together and you get the user experience from ****!
The icing on the cake is the fact that I could set up workarounds for all of these things in Windows, if it didn't already provide built-in solutions. E.g. setting it to stay awake when I close the lid is as simple as configuring the built-in Power Management settings via Control Panel. Rectifying this forward delete problem was doable via a third-party key remapping utility. And so on...
But on OS X, I need a third-party utility to keep my Macbook awake, and I can't find any way to remap any keys that actually works! KeyRemap4Macbook is touted as the bees knees all across the Internet, but I think it is an absolute useless piece of crap! Just like the OS that it's installed on...
Come on Apple, if you really want to win the PC/Mac war, you're gonna have to try a little harder...when a different vendor's OS works better on your hardware than your own OS does, surely you have to ask yourselves why...