Fragility Index – Why?

Fragility Index is a completely useless metric. Literature is filled with studies claiming that findings in some field in medicine are fragile. Maldano et al conclude:

A systematic survey of hip arthroscopy RCTs resulted in a low FI, indicating that the findings tended to be fragile.

What is the point to calculate FI for outcomes which were not primary outcomes in the first place? I just don´t understand.

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