i would disagree that the arrows is uncommon nowadays , loads of games on here use them as standard - in fact ALL pico 8 games use them ! look at the big games such as ori , hollow knight etc and they all use them ( but have the option to change if required )
if your on a laptop like me i dont have the space around me for an external mouse so have to use the trackpad , hence its awkward... im also left handed but have grown up gaming all my life using arrows so switching hands is difficult !