HN user
I'm assuming he means that solid-propellant rockets are conceptually simple to make; rocks being either the explosive at the end (akin to throwing stones) or maybe the basic fuel and oxidizer propellant mix. Either way it's the idea that the most well funded military on earth could make another rocket factory easily if needed.
I see that it says it stores images "in an HDR format by default" but keeps referencing JPEG output. Are you using JPEG-XT? There aren't a lot of "before and after" comparisons so it's hard to know how much it's taking out. I figure those would probably hurt the reputation of the app considering its purpose is to un-pop photos, but I'm in the boat of not really being sure whether I do actually like the pop or not. Is there live-photo support, or is that something that you shouldn't expect from a artist-focused product?