Personally, I wish 8BitMan would charge gyro more. He tends to just throw out an endless stream of hitboxes to zone the opponent, but I think charging gyro is valuable because it increases the effective unreactable range (by increasing the projectile speed), while also creating a threat and forcing options in neutral while keeping ROB's options fairly open. I'd also like to see him utilize more tech like grounded reverse gyro, which I think is very practical. He has at least started to utilize z-drop aerials, which I am very happy about.
Also, all the top ROB players have different styles and I'm not sure what style is the most optimal; different styles are probably optimal for different MUs. I think his ledge trapping is still under-developed, but that is likely because his simple BNB traps still work far too consistently even in high level gameplay; it pains me every time ROB rolls to the ledge to predictably set up the reverse gyro, and then the opponent just does regular get-up into it and gets hit by usmash.
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I'm also curious about Ness. To me, he was a character with mediocre theory, but his top level results were too solid to ignore so it was difficult to argue that he wasn't right below the top tiers. However, Ness' recent results have been mediocre at best, and it seems that the original theory was correct and Ness' fundamental problems are finally showing through. I'm curious what his MU spread with the top tiers looks like, and if he has any redeeming MUs with them or if he can be safely considered worse than a character like Toon Link.