There continues to be a lot of misinformation about how this all works.
If you need the "amp in the room" for some reason (and you don't alway, even if you think you do), then you need an amp and a room. And yes a power amp into a standard guitar cab will often do the trick, but an FRFR will never be this. Ever.
If you need the "amp in the next room, miked up and coming through the PA or monitors", then a real amp in the room obviously won't give you that, and can sometimes be the wrong choice for the gig or the environment. For this you want the best FRFR you can get, and no the Alto or Headrush is never this.