never played Zoo Tycoon 2, but the mode gotha "fit the game", if the game got little to no customizion, then its pretty useless. In PlanetCoaster i enjoy more the challenge of keeping customers happy, create popular RollerCoasters and creating the most aestic pleasing park, so in that game "earn money" is the least intresting aspect, even tho it creates some intresting sollutions when you need em.
But thats becouse of the amount off stuff you can do with the park and how you build. In games like Cities Skylines and rollercoaster Tycoon, it getts boring, since nothing matters other then the money. Since its little you can do to realy create something your own, or somthing that sticks out. Its just standard assets you place in smart places to maximase profit. Aaaaaaand from what i suspect from what ive seen and read about this game, it might be in the Cities Skyline box, that making the park earn money and not getting visitors eaten is the main focus, so Sandbox in this game arent that important to me. not expecting large enough islands to build on or enough variation in buildings for sandbox (as practice or creative building) to be necasarry.