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If somehow you could have the same phone but with a resistive, single-touch screen and use it just like you use it now, then you would learn what:

a resistive screens do actually need to be pressed instead of just touched, if you never get a literal sore thumb from a touch screen usage - well you don't miss anything but it's quite painful after a while and adds to a carpal tunnel syndrome

a multi-touch sensor greatly helps when you need to discern and filter out the false positives

There's a difference between "optimized for" and "it's the only thing you need".

I could in theory get by with + and - buttons to zoom in and out of a map, but it's way more convenient to use pinch to zoom. But even for the browser, I use pinch to zoom all the time.

You can do things with your hands (fingers) This gives many people an enormously satisfying feeling.