Shaing Yi-Chaing and Liang Mong-Song have some serious beef from the past and they disagreed about SMIC’s direction. Liang made SMIC choose and SMIC chose Liang.
I certainly don't know enough of the politics of what happened to judge any side of the SMIC question.
Shaing Yi-Chaing's accomplishments in copper interconnects alone deserve awe; he was ahead of IBM, and he did it on instinct/"the school of hard knocks."
More astonishing is the work ethic, and the institutional memory that prevented future mistakes from the learning of past errors.