强机制、强品牌、强渠道的三重壁垒，使后入局者必须在疗效、安全性或特定人群定位上实现显著差异化。
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If Go introduced typed error sets tomorrow, os.ReadFile would need to return something like os.PathError | io.EOF instead of plain error. Every single caller in existence would break. All the errors.Is() and errors.As() machinery would become either redundant or need a complete redesign. Third-party libraries would be split between old and new styles for a decade. The standard library itself would feel like a legacy API overnight.
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