The argument that this group shouldn't get top billing or decent billing at a festival is so stupid.
If Slash, Dave Grohl, Flea, and , idk, let's say Miles Kennedy formed a new band, they would hands down get top or near top billing at whatever festivals they were playing at. Even if they didn't have a lick of original material out there for public consumption. The Plastic Ono Band got the exact same opprotunity back when that was a thing.
When you draw the lines from SoA, you'll see the connections they have are pretty huge. Between Kiss, Alice Cooper, Van Halen, Creed, Scott Stahp, Trans-Siberian Orchestra, Zakk Wylde, Joe Bonamossa, Jason Bonham, Dream Theater, Twisted Sister, Avenged Sevenfold...
I mean, holy fucking shit. Why would this band NOT get top billing. News flash: every single member of this band has paid their dues, they've all established their names, and they all have massive "street-cred" when it comes to the rock and metal scene. They deserve it. If James Labrie was the singer of some random supergroup and they got top billing, I doubt most of you would be making the same fuss you are making here. You would be applauding.