Healthy people do not suffer from obvious strength deficits, but subtle weakness is rarely clinically significant, and maybe never. There is little or no overlap between a strength deficit that isn’t obvious and a clinical problem that is.
And most rules have exceptions. For instance, I wrote in my last post about Lee et al., a study that demonstrated a non-trivial injury risk from hamstring weakness that probably wasn’t obvious without careful strength testing. So is that an exception? A case of non-obvious weakness that actually is a problem? Perhaps. But it was also very much “just one study,” and contradicted by others.
Even if true, the point is that it’s still an exception, a rarity.