Most grab hitboxes last for two frames, unfortunately.
Also, regardless of the input delay, most options are neutered by defensive play because you must learn to respect the powerful options your opponent has. If you try to hard read a spotdodge and punish it, you have to be a certain distance from your opponent to start, and if the opponent's Snake just decides to F-Tilt you instead, you're screwed. If you guess incorrectly the other way, and he spotdodges your attack, he can basically do whatever he wants to you. You're always better off abusing the physics to your own ends instead of putting yourself at great risk just to actually fight in the first place.
If you do something early, then the opponent can anticipate by (surprise!) just moving away from you. Worst-case scenario, he's unharmed and can put himself in the original position pretty easily.
It's just a terrible loaded-dice situation, and it's definitely made significantly worse by two frames of uncertainty. It's always better to play a very specific way, and all the top players do that to the fullest. Consistency is literally impossible for many common scenarios, and that makes me really sad.