Both of you highlight the difficulty (actually the impossibility) of making an amp higher powered yet at the same time not changing anything about it. The WA's limitations were also its greatest asset IF you could live with the limitations.
These limitations have nothing to do with being class D either, nor does it have anything to do with the tube type, it's simply because what's happening in the WA doesn't scale to higher power. Once we got into the redesign, we approached it in a way to make it "better" for those players who were unable to use the WA due to these limitations. Therefore, the tone and feel will be quite close not be identical by design.
The WD addresses the needs of those players who wanted much the same time and feel as the WA but couldn't make the WA work because it was too compressed or too bloomy and became inarticulate at higher volumes. This was a very real challenge for gigging players who needed more than the amp was capable of. The changes and added features came directly from player requests here on TB.
If you prefer the original WA, keep yours. If you don't have one, there are plenty available on the used market and likely will be for quite some time.
At one stage I had TWO Walkabouts. I can't see why ppl that need the sound of the original WA don't simply do this, slave one into the other.
It ain't as tho they're heavy or large and a problem to move.
That has always muddled me