To these to points I‘d argue that using an Illusion game allows you to produce renders faster, because you don‘t actually have to render anything. As you said, it‘s non-trivial to get everything right, but after that you are done. Screenshot it and you got your render.
Using DAZ you have at minimum the same amount of work for posing, lighting etc. Additionally you then have to actually render the scene, the time of how long this takes depends on your computers power.
Given the same amount of time and skill level, a dev using DAZ will likely create less renders than a dev using an Illusion game.
As such it is expected of Bluecat to have a created a massive amount of renders during the downtime of this merge.