If a person wants to go straight to a park on arrival ( for a hard ticketed event, for EMH etc) having the bands in hand allows them to do online check in from their phone be eligible for free parking and EMH.
It also works perfectly for the scenario we did it for which is staying offsite but booking and paying for a onsite room .. that gave us access to an earlier booking window for fastpasses and dining . We used the room mid day for a break . We were a large party and much more comfortable offsite for the duration of our stay, It worked well for us to have the bands shipped. It cost us $5 and 30 minutes of our time ,
So yes OP we’ve done this and had no problems .