我估计你是误解了曹老师的意思。在用现在分词表示被动意义时,当然是要用被动式啊,怎么会是画蛇添足呢?至于你的句子:
Being distracted can make effective encoding very difficult.
这里不是动名词的被动式,being distracted 其实是系表结构,distracted 在此为形容词。
Being loyal to his boss, he has been promoted recently.
没有哪里说过,静态性质形容词不能连用 being 吧?估计你是把静态形容词不能与 be 的进行时态连用搞混了。being 表原因是很常见的用法。