If most of the amps sound very similar: wouldn’t everyone be playing a Peavey Bandit? (Which are also inexpensive, reliable, and fairly loud).
I must inhabit a parallel universe, because all the AX8 amp models I’ve spent some time with (maybe 20 so far) sound and handle different to my ears (sound different recorded, too). A Diezel will go places a Tweed Deluxe can never get to and visa versa. The AC15 model is different from a Matchless or Morgan or AC30 which are similar circuit designs. A JTM45 is a whole different animal than a Bassman even though the circuits are nearly the same. Each channel of the Dumbles or their derivatives are discernibly different and respond differently. Heck, swap in the 12AX7B for the 12AX7 in the preamp and it sounds crunchier. An EF86 has a different kind of definition when you overdrive it. So customizable, so cool.
Maybe its because I approach each amp with seeing what it can do and where it wants to go, rather than staying with just the meat and potatoes clean, crunch, lead tones (which is all some pros I know ever need): Getting the same tones out of a bunch of different amps makes no sense to me: If that's the goal: why not just use one amp?
Or maybe its because I’m usually on a slightly overdriven ride which distorts or cleans up depending on picking dynamics: which varies in character from amp to amp.
IME, all the different amp timbres in the AX8 bring up different ideas: One Dumble excursion ended up with a horn feel and I was riffing on Wayne Shorter. The Swart got me off into some North Indian keharwa I’d forgotten I'd forgotten. I, for one, really appreciate the variety and attention to authentic detail, and find it inspiring. No depression in sight.