> an on-screen keyboard makes different inputs easier
Sure, it can certainly make different inputs easier. But you'll be hard-pressed to convince me that those different inputs are better specifically because a touchscreen doesn't have the kind of physical feedback that comes from feeling the boundaries of different selections (eg, letters/characters) for that input.
With a keyboard, I can center my fingers without looking at them. I know exactly what input selections are nearby and in what directions; and I know exactly when my finger has crossed the boundary of one and is in a null-zone or is on another input. For many keyboards, I can even feel the embossing of the individual input selection (character).
Sure, it can certainly make different inputs easier. But you'll be hard-pressed to convince me that those different inputs are better specifically because a touchscreen doesn't have the kind of physical feedback that comes from feeling the boundaries of different selections (eg, letters/characters) for that input.
With a keyboard, I can center my fingers without looking at them. I know exactly what input selections are nearby and in what directions; and I know exactly when my finger has crossed the boundary of one and is in a null-zone or is on another input. For many keyboards, I can even feel the embossing of the individual input selection (character).