Not quite. A touchscreen can detect many fingers, that can do many gestures.
The problem is, exept zooming (pinching with 2 fingers) and moving around (swiping with 2 fingers) the potential is pretty much unused.
Intuitive (like swiping and pinching) is none of it though and it can only be useful once muscle memory kicks in. So I guess this is the reason, we do not have a global standard for anything advanced multitouch.
I think you're wrong. There are very few combinations available for things like text editing.
First, (iOS perspective but it’s not that different than Android) to convert the suggestions row to a row of function keys anytime Shift was held down. No annoying delays or extra taps waiting for the menu pop-up. So now you can use two fingers to cut copy paste undo instead of using several seconds and a popup that can appear anywhere onscreen. Next, arrow keys. Heck, use the same Shift hack and, when Shifted, replace the space bar and the dead useless area below it with a big inverted T. Our phones have gotten much bigger and yet especially on iOS the keyboard hasn’t grown a pixel since what, iOS 5? Case in point: no number row still for Apple, even as an option. Wtf.
2 fingers is already too much. Maybe I could've done it with 2010 smartphones, but new ones are so large that I switched to double-tap then drag ages ago. It's annoying having to involve a second hand just to zoom something, and trying to do it with a single hand is just a recipe for destroying your phone.