The best way isn't the only way. It's just the best way. The fact that the A4S first clear on Chinese servers was by a relatively ungeared group (together with the various things groups like Lucrezia have done at very low item levels) shows that perfection is far from necessary.

Nor is the best way in general the same thing as the best way for a specific group or individual. If someone is more comfortable on a particular job, it's possible for them to perform better with it than with a job that may, on paper, be superior.