Regarding lack of debate here (and other online forums, e.g., dakkadakka) and it indicating lack of interest in AoS or little to discuss, perhaps it's got something to do with the medium? You ever checked out AoS Discords? Buzzing. For example, there's an entire sub-thread dedicated to the particular list style of SCE I play. The chat never stops.
This is just pure speculation but I get the impression online forums aren't something younger generations really engage with.