Codswallop. The problem of the Episcopal Church today is the problem of America's schools, colleges and universities. All of these are administered by leftists. In college students get indoctrinated in deconstructionism, Lacanianism, feminism, queer theory, multiculturalism, and identity politics. Students take these ideas with them when then enroll in seminaries. Theology then reflects this nonsense.
Until the schools are reformed, the moral relativism of the educationists will continue to infect every institution in America, whether secular of religious.
There is undisputably a weakness in the liturgical churches that makes them more vulnerable. My personal theory is that the high level of ritualism implies that religious truth is allegorical, while churches with few or no rituals (often accused of "rationalism") have no need to redefine "allegories" they don't believe are allegories to begin with.