As far as l know, arborio rice is for risottos but l think it could be used for paella.
When l travelled in Spain and Southern France, l learned how to make paella, but l remember it was recommended to cook it on low heat after the rice was put in until some moisture is retained but rice cooked. Some cooks use vino too, keep adding liquid to the pan if it becomes too dry while cooking the rice.
Paella should be moist at the end but not gooey like risotto. Definitely not dry.
Nobody been able to cook rice properly on high heat, yet!
Paella or risotto, like proper Martini, should be shaken, never stirred!