Personal preference for location of safe zone
This is entirely personal preference.
The current safe zone system, which becomes easy to understand once you've memorized it, isn't very interesting. Personally, I think the most enjoyable feature would be a completely random change in the safe zone. In addition to what I mentioned above, I think it would be good to add a function that automatically adjusts the position of the final safe zone to some extent.
While the fact that the element of luck becomes so large is a disadvantage for e-sports, the benefit is that you don't have to spend the unpleasant time memorizing the final safe zone. For me, I would choose the more fun option even if it involved a larger element of luck, and when watching gameplay, I find it more enjoyable if the outcome isn't known until the very end. I think that the ability to reduce the luck factor as much as possible is also a part of being a professional player. And even if the safe zone is randomly generated, I think the match will still be determined by skill.