You should tell this to Brad, who has that as a modus operandi. I have heard it at AG factory and at 4 private owners, including with digital, analog and tape, AG amps, 45, 300b, and Ayon 30w 300b.
Maybe, but I have only heard AG and Vox Olympian at shows, yet Aries Cerat horns sound so much more natural and not peaky and forward as I hear AGs in a show setting. I agree shows are not best for acoustics, but all have the same challenges to deal with. I also accept an AG set up at home really well may sound great. Just I have not heard it yet.
AGs I have heard seem to be a bit peaky and brittle up top, shouty. I was never able to relax into any AG room and enjoy the music. Horns I did do that with are Aries Cerat (all models), WE 1930s (various specs), Odeon (all models), some Cessaro, the new Supravox speaker.
NOT great IMO were Tune Audio, AG, Big Chinese system (sorry I don't know the brand), Viva Horn system (recent) and many smaller boutique offerings. Some other examples come to mind that did show promise, but had something not quite right. Frustrating.
The thing with horns is IMO they are very difficult to design. The benefits are huge if you get it done right, but it takes skill, years of work, testing, many challenges. And if they are NOT done right, they can be really hard too live with.
The bigger the system, especially if you want to go full range with active bass, the complexities mount. Then the size, cost and finally availability of top quality compression drivers ideal for your design. It is not easy. Magico had 'a go' and look where that ended up.
If I had massive budgets, I would be ordering a massive horn speaker right now, as I believe it is the route to getting closer to live sound. The other routes can be fine, but IMO don't quite get there.
I would fancy a DIY build, as if you can find the drivers, and good plans, it can be done. Many wood artisans have CNC machines now, so you could buy in the resource. Time consuming and risky maybe, but you could end up with an end game speaker for sure.
Finally, I found it encouraging this thread is here, Horns can get a bad rap, or as bad, forgotten amongst the blingy 'yet another cone speaker for 200k'. We need more horns!!