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I looked up the dictionary, and found "よう" and "わけ" are both grammatical nouns (形式体言). But why is the 接続 different?
Moreover, I found many sentence patterns have their own rules. Are there any universal rules which determine which form you should conjugate into?
It's because の emphasizes possession
AがBなわけだ → AがBであるわけだ
AがBのようだ → AがBの様子をしている
But の can also function as the copula, and ～であるよう can work, so both are viable. The meaning is just not as strong or obvious so the usage tends toward this.
