"But as useful as it might be, it's not really so useful that I would sacrifice a portion of my melee attack power bonus for these things."
Although the suffix of the Sumo Wrestler indeed matched Zhang Yanhang's usual combat style professionally, the fact that choosing this suffix would reduce his attack power bonus was something he couldn't tolerate.
He always believed in the principle that 'One Force Breaks All Techniques,' so the idea of permanently lowering his attack power to exchange for temporary strength increase—and a not so high amplification at that—seemed to him to be foolish. Rather than pursuing such an effect, it would be better to retain the permanent, cost-free increase to melee attack power from the start.
After vetoing the Sumo Wrestler suffix in the first option, Zhang Yanhang began to look at the second option, 'Heavy Weapon Master.'