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I think everyone debating is agreeing that the greater the sprung mass, the better (what is better though, grip or comfort, that's a whole other debate) the suspension is going to work.
The various affects of splitting that mass between rider and bike can be debated to death.
Something important that hasn't been mentioned is the inherently long chainstays on ebikes, surely this has to factor into the perceived increase in "calmness" and "grip".
@chief, I get your anology on arm pump and a really large bike mass, the anology can still apply to the one body model and the two body model. On a tangent, it's compromise though isn't it, who's going to ride a really, really heavy bike to cure arm pump, you'll be compromised on handling traits.
Aren't we also getting onto rider preference and styles now too, @chief it sounds like you're really concerned with how well the bike monster trucks through rough stuff, I'm more concerned with the bike doing what it's told, I'm sure that's driving our arguments a certain way too.
Jack wouldn’t tell us the weight of the lead but just said he’s been working with Chris Porter from Mojo, and through testing has found that by placing the extra weight behind the stem and at the bottom bracket helps to calm down the forces and roughness from tracks, keeping the ride planted.
It is track specific however as Jack says it feels good on the fast and rough tracks but made the bike feel a little dead on the tight and twisty sections.
They really built that up [edit: I mean they metaphorically hyped it up on the internet] for Ft Bill, then he snapped chain after about 30 seconds. Never heard it mentioned on any subsequent races.