Why doesn't Samsung update the Touchwiz UI for older devices getting 4.4.2 KitKat?

This is just a thought I had. I currently have the S5 with the new Touchwiz UI. I was just wondering. Samsung has released KitKat on older devices like the S4, Note 2 and Note 3. Why do they keep the older UI on those devices? I feel like the S5 UI, as far as notification toggles, settings menu and textures, should be available to users of the older devices. One thing I have to give Apple credit for is that when a new OS, like iOS7 releases, they update the UI on all devices even 3 year old ones like the iPhone 4.

I know this is not a big deal, as our Galaxy devices do a lot more even with an older UI, I just feel like it would unify the Galaxy ecosystem more. Anyone using a phone that is less than a year old but with the latest software update should enjoy the same new UI as newer devices. I also look at HTC as an example. They are updating the One and older HTC devices from 2013 to the Sense 6 UI. Samsung really should start doing this.

Thoughts or further discussion would be great.

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