Jin Yong sure explored a change of philosophy between 2 novels.
in ROCH, he wrote: 杨过但觉越是平平无奇的剑招，对方越难抗御。比如挺剑直刺，只要劲力强 猛，威力远比玉女剑法等变幻奇妙的剑招更大。
The more ordinary the sword stances, the more effective against the opponent. Any ordinary stab backed by abundant internal energy will yield much more power than the dazzling stances of arts such as the Jade Maiden Sword Art.
And in Smiling Proud Wanderer: 但不论敌手的内力如何深厚，到了“独孤九剑”精微的剑法之下，尽数落空
Yet regardless of the opponent's abundant internal energy, it would be useless when facing the fancy sword stances of Dugu Nine Swords.
Those 2 arts by the same guy Dugu Qiubai are totally at odds with each other.