I cannot honestly say if I am more or less confused about the role of DTR in terms of item prioritization. Still, I'd think it is a lot less likely that damage is 'rolling over' between DoT ticks, than the possibility that it is. Occam's Razor would suggest that they are simply truncating the decimal during the damage application process, and by that merit alone, DTR is worse on lower potency abilities.

I've also never seen any bulk of work on SMN damage formulas that would conclude that DTR is anything more than half as beneficial as crit is.

But yes, admittedly, it is all speculation and theorycraft at this point, I suppose I'm merely representing the majority of efforts made to try to attempt to explain stat weights as I've been exposed to.