Not only can they trigger action. They can also bring you problem! And make it harder to move.
If you are in the top right box you have it all. But having it all might make it harder to improve. If you already have a good car - why get a great car?
If you are in low right corner you have one of two. That will make the game tough to play. You need to get the second - and still keep the first. Same with top left box.
In the low left box you are free. You have nothing and can move in any direction. No need to protect anything. Nothing to watch. Moving in any direction will improve your situation.
Since I like to think in metaphores - here we go:
Here you can have a mouse and a bird. The real winner - in the absolute top right of the system - would have a large bird and a huge mouse (or rat even!?). Having any bird and any mouse will of course also place you in the top right box.
Imagine holding a bird and a mouse in your hands. Both alive of course. How easy is it now to upgrade to a larger mouse. Let go of the mouse in hand - and try to grab a new and larger one running by? Same with bird. Let go of the bird and try to catch that swoooshing-by bird. That is hard! And risky. You might loose what you have when you try to improve.
It's a bit easier to have a mouse in hand and try to catch a bird. At least slightly. You can even try to grab a larger mouse while holding a smaller. Tough work - but possible.
It is easiest to hunt down a mouse or bird if you have nothing in your hands. And you are also free to choose strategy. If you aim for the bird first you will look up and hunt in the air. And if you go for the mouse you can start to crawl on ground tracking the beasts.
So, being in top right box can paralyze you. You have your hands full being there so you have a hard time improving since you like to avoid risks of loosing. In two other boxes you have a least one hand free to hunt. A bit awkward since you need to protect what you have - when hunting in the other dimension.
Having nothing gives you freedom to select strategy and nothing to loose. And keeps you very agile since you have all hands free...
Having nothing can make it easier to catch the largest bird. Or the most impressive mouse.