Perhaps i just prefer my UI to remain as i want. i got used to TouchWiz with my first Samsung product, my Galaxy Tab 2 10.1, and the familar look continues through to the previous S3, to the new S4. it remained familiar while giving me more options to play with. there's the addition of more S-Voice options and a faster UI, Air View, Gesture, a superior update to the stock Camera app, better depth in the main home screen, while maintaining the balance of flat and 3-D. you can notice the familiar toggles in the notification shade, the presence of color in the notification icons, with the transparency being an improvement without turning it hideously flat or removing things. the icons have a half-flat, half-3D look. i like that. buttons look like buttons (see samsung music widget) and widgets are outright beautiful and take advantage of the high resolution, 1080p capable OLED screen. to lose all that in an OS update or in the new S5, not an option for me.