Hi, it's based on control quality guidance and a bit of common sense in the flight control system domain:
1. With reference to MIL-STD 1797A, the F-16 is rated Level 1 in control quality, and a well developed phugoid to such extent is a very unwanted characteristics, that could immediately lower the control quality score rated by pilots.
2. This unwanted characteristics, if exist IRL, should be recorded in the Flight Characteristics section of T.O. -1.
3. The AAR gain is designed to be flown from 0 to 400 knots airspeed, and in this region of airspeed, the pitch-rate response should be consistent.
4. This behavior does not exist in the previous version of DCS F-16, which exhibits a very well dampened pitch-rate response. Considering this is not on the update/bug fix list, we need explanation from ED on which DCS version exhibits the correct behavior.