Feature phones were entirely different beasts. Screens were typically smaller, and much better protected (either with a platic window covering the screen or by the keyboard folding over the screen, which also protected the buttons). Likewise, the buttons tended to be much better protected (either when folded closed, or by having a keyboard on a slider). On top of that, they were very user hostile. Consider your texting example. Between cost and size, most people were repeatedly bashing each key on a numeric keypad to get a single letter. Few phones had touch screens (the screens were too small for them to be practical), so navigating through options was considerably more difficult.

Oh, I know that alternatives existed. Complete keyboards. Larger screens (but by no means large by current standards) with touch input complimenting the keyboard. I had one of them. Yet it was nothing compared to what we have today, and I doubt that we could have what we have today with what we had then (buttons!) without seriously compromising the size of the device or the durability of those buttons.