[anm89]

If you define man as human and we have open events to let people determine who's fastest, it's totaly reasonable to assume he is actuality the fastest man alive. On the other hand this isn't packaged as some sort of scientific claim and has a lower burden of proof.

I don't think anyone beyond an anecdotal context is explicitly claiming hawking was the smartest and either way, it's not measurable and so is inherently subjective.

Delicious, subjective opinion.

All of these are reasonable statements, it's clear up front that they are subjective statements of opinion or their scopes keep them within validity.

Saying a magnetic field is the strongest in the universe based on a measurement in defined units is drastically different type of claim than the ones you mentioned. In this case it's an invalid claim so we should probably stop saying it.