You have a good point just I do want to stress to avoid making your plans for the game too rigid as can lead to just much issues as scope creep long term. Though this isn't an objection to your current plans. Since naturally you would need to get your core gameplay loop down and figure out the rough direction you want to take the story first before you can implement more minor features to flesh out the game.
I will say like your past works so I will be following the direction this game takes regardless to see where it goes.