Text that is to be edited should be in monospace font if arrow keys are not provided, for example on smartphone touchscreen keyboards. It is very difficult to precisely position a cursor among narrow characters in proportional font using mouse or touchscreen.
The same could be said about text that is to be selected, i.e., for copy and paste. However, those two encompass all uses of text. Perhaps the key is for the user to be able to change the font of any displayed text to suit the need at hand.
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