Is cultivating in a dual inner wilderness faster than cultivating in a paragon town then?
Edit: I ran a comparative test and yes, it's far better. Almost six *times* faster, in fact. With my current stats (Core 5 with all general Imperial bonus items bought) I got only 29 condensed Qi per 100 years in the paragon town vs 168 condensed Qi per 100 years in dual inner wilderness. But inner mono gave less than 17 condensed Qi per 100 years, so it's slower than paragon cultivating. That's probably why I didn't think to test inner dual earlier, as I hadn't noticed any benefit previously to wilderness cultivation over paragon cultivation.
One oddity I noticed, though, is that in the inner mono wilderness (air), I encountered no battles at all while cultivating, but when I was in inner dual (water/air, if it matters), I did encounter battles while cultivating.