You guys do realize that the difference in airspeed between flaps 25 and 30 is only a few knots. Landing distance is also negligible. I know different airlines operate the same type of airplane differently, but those differences are not dangerous, just different. Case in point, at Delta we operate the 757/767 at flaps 25 and AB 2/3 on a regular basis. Tail bumps, while rare, happen on takeoff and not landing. I've flown the plane for the last 9 years, almost exclusively F25, AB3, idle reverse. Never got close to bumping the tail. The only exception is the 757-300. That is an F30 plane. Otherwise, just fly it like the 767-300 and all is OK.

Anyway, the differences in operating procedures isn't dangerous, it's just different. But, YMMV.