I don't think a .245 hitter is deserving of any awards but I guess in today's baseball climate, it may come down to that.
In your beloved 60s Ron Hansen won ROY with a .255 average. Curt Blefary won with a .260 average. Jim Lefebvre won with a .250. Earl Williams won with .260 in the 70s. A lot of guys were getting votes with < .250.
If the 50s are better Bob Allison won with .261, Luis Aparicio .266.
Even Pete Rose and Willie Mays only hit .273 and .274 when they won. I’d take Gunnar’s line over Rose’s with a similar OBP and way higher SLG every single day.
Cal only hit .264 his rookie year when he won, then Ron Kittle and Darryl Strawberry won the next year at .254 and .257. Jose Canseco won with .240, Walt Weiss with .250. I didn’t go to the 90s or later.
Is .245 all that different from .260? 9 hits over the year if 600 ABs, or 1 every 3 weeks. The historical standard for ROY isn’t all that high, I don't think today's climate has anything to do with it.