Problems with the egg
Although Meng Qi could also engrave runes on other things such as bracelets, rings, earrings, necklaces, and boots, Bai Zemin did not forge any such items. This was because his current bracelets, rings, earrings, and boots were of much use to him.
Even if Bai Zemin ignored stat points, what he really cared about were the skills and effects attached to his current accessories and boots.
Taking his boots as an example, the fact that he could activate a skill that increased his Agility stat by an extra 100 points was simply too tempting and useful for Bai Zemin to be willing to give up on them so easily.
100 points of extra Agility was no small thing at this stage, 100 points was more than enough to decide winner/loser and who lived or who died in a fight. This was especially true if the boot skill was used wisely at a crucial moment in the combat.