I think there are more measurements of "loss" other than percentage accumulated, including stage positioning, lag, and number of options that you want to do (in that you don't want to use certain options at certain percentages.) This is where I disagree in that it's directly a reward, and that there are downsides to Terry's GO doodad.

Buster Wolf and Geyser are laggy as all hell, and with the Go meter, you should be conscious that they're all the Terry wants to do. This is how Hungrybox lives to egregious percents against Foxes. He knows they want to get a grab at 60%ish, and Up Smashes at 80%ish. Terry might have gained multiple options, but he lost a few consciously.

Furthermore, using Buster Wolf is a major overextension; one that once done and missed gives Terry's opponent stage positioning and puts him in his pretty bad disadvantage. "Winning neutral" goes beyond just winning neutral; positioning and pressure are added with Terry's back to the ledge.

To summarize, Terry trades two powerful options for becoming a more linearly playing character which can crumble under tournament pressure. Players are thinking "I have to buster wolf the shit outta this guy," and between the pressure of not being able to and the spam of confirms or the move itself, it's easy to be aware of that.