Devs – swampys are fine on roots, especially in softer compounds but there honestly are better options.
I haven’t found one. Most folk round these here parts ride HR as they seem to be the best all rounder and you can trust them on the wet roots. Now I’m not going to claim that my forest is better than yours but all our trails are natural and I cannot think of a better place to test tyres on roots. It’s kind of strange too that you mention the mobster, which, according to the Maxxis blurb is for hardpack yet they specifically mention wet roots in the blurb for the Swampies.
Also, contrary to your thinking, it would appear that the second (or first in their opinion) most effective wet root tyre in this parish is the Mud X. And yet we have no mud on these here sandy parts. Who’da thunk them marketing folks could get things so wrong huh?