Ha, that holds even less water.
- Progressively unlocking features for use in a completely separate game mode is not a core design feature of games of any genre. Can you imagine if playing a multiplayer game of StarCraft would only allow you to use units you unlocked in the campaign? No games use this design. Imagine playing CoD Zombies, but all your guns are locked until you ladder up the competitive mode? No other games require you to progressively unlock core game features in one mode before you can use them in a completely different mode. It's not a thing. You don't have to mine a block in Minecraft before you can spawn it in creative mode. That would be tedious, stupid and just poor game design.
- If your only criteria is "progressively unlocking content" without allowing any further nuance then there's no reason for you to even disagree with anyone here. You could add a free unlocked sandbox right now and JWE2 would still work by progressively unlocking content. If you restart your campaign or start a new challenge mode level, you will still have to "progressively unlock content" just like all those other games. The feature you are defending will still be there, an unlocked sandbox mode does not remove it at all.
- Sandbox modes are not features of those other games and genres at all. You don't progressively unlock Sandbox modes in RPGs or FPS games. How can a feature transcend genres when it isn't even in those other genres? Almost all games of JWE's actual genre, park builders, do come with unlocked sandbox modes. And even the ones that don't, like the original Zoo Tycoon, had you unlocking the features IN the sandbox mode instead of somewhere else. It's been an expected feature of the genre since the days of Rollercoaster Tycoon. The fact that JWE1 didn't have it was a bizarre oversight, JWE2 even moreso.
- The way you unlock sandbox content in JWE2 isn't progressive at all. In JWE1 you unlocked something and carried it to the next level, and everything you unlocked along the way came with you. That's progressively unlocking features. JWE2's Chaos Theory and Challenge Mode scenarios have no such progression between them. You don't take anything with you and the order of what you unlock for sandbox is random and arbitrary. You're not progressing anything except the stand-alone level you are currently in. You're not progressively unlocking features, you're unlocking the same features over and over and just occasionally finding a new random one that doesn't build from any previous ones.
- No, I don't concede to you that JWE2 has the same feature as JWE1. JWE1's feature is "unlock sandbox through campaign play". This feature isn't in JWE2. To paraphrase your own post: "That is a very poor equivocation. Story and challenge mode are in no way interchangeable so I'm tempted to disregard your entire post at this absurdity. I feel stupid even trying to help you understand that unlocking through challenge mode is in no way similar."