I've seen arguments for both sides, that were both valid.
A friend has a rack with two preamps, each preamp having totally different sounds, one preamp having two channels. Besides his stomp boxes, he's got three channels worth of tonal variety. So for someone who's insanely creative and doing all kinds of stuff with his music, he needs it.
Me, I want one all-purpose destroy-everything tone, and that's it. I let my guitarists do all the fancy tonal effects and two-part harmonies and stuff, while I just lock with my drummer and make bowels move from all the rumble. So for me, one tone fits all.
Your needs completely dictate your rig. I know the WT800 has a ton of available variety and options, but even if I bought that amp, I'd still just set it to one all-porpose setting and walk away! A good rig is a good rig, depending on who's using it for what purposes.