There are at least five reasons that progressive dispensational (PD) represents a departure from a normative hermeneutic (literal grammatical historical) and reading of the Bible. The first two pertain to methodology in arriving at conclusions, and the latter three have to do with theological conclusions which are not exegetically derived.
The Complementary Hermeneutic Is a Departure from Fixed Meaning
Blaising and Bock recognize that methodology is definitive in the formation of PD, and acknowledge that PD is the result of a methodological departure from the hermeneutic of classical and revised dispensational thought, as they observe that,