If we take Roshi's feat as an outlier, then we wouldn't found any realistic solid background basis for Piccolo's moonbust; and then, by aplying this very same logic, we can consecutively deny any of the following feats by stating that "there is no real solid background basis for them to be able to do what they actually did", and then we would ultimately end giving them no feats, and we wouldn't be able debate them.
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Roshi's moonbust was the first time they showed to blew up a celestial body in DB universe series as a whole, and it is as a feat, the solid background basis that tell us that Piccolo's was a reliable feat, and this last one also has a retroactive effect that tell us that Roshi's was reliable too; and then both feats act as a background that tell's us that the follwing feats and statements are probably reliable.
Roshi took a lot of time charging, and after that, he had almost no energy left, and Piccolo did so with a fooder blast, it also help's us to visualize the improvement in power that characters like Piccolo and Goku had in DB, that couldn't see because of their lack of feats, and during the timeskip, which is outside of both series.
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Besides, the Earth only has one Moon, so it is not like they could have had any chances of repeating the feat any time soon.
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