By that logic, even Loud is better than Optic cause they beat them in bo2.
If a team beats one in a bo2 and vice versa in a bo3. It should be undisputed bo3 win matters more.
The guard were having a honeymoon period, also it was not an elimination match, both teams qualified.
Also, I don't think you need to downplay FS here. APAC was objectively better than JP in year 1.
FS themselves had a good chunk of star players. Moreover, finals are bo3s because it is an undisputed fact that it brings out the best teams on average.