Yeah i dont think full URL is important to the majority of people just browsing, examplified with Safari just showing the base website URL and only reveals full when clicking in the adress window. (an aproach which could be adopted in a sidebar URL)
Im not a sidebar user myself. but would consider it if all information and functionality got moved the the left. instead of only some. instead both top and left side getting cluttered
I can also understand if the Orion team this early doesnt want to replicate the feature wich at current moment is kinda Arcs thing that seperates them.
But i think its a matter of time before there aproach gets adopted as an option by other browsers. since it gives you even more vertical space without any loss of functionality