Using age grading, a 1:04 for a 30 year-old man is 91.22 and a 2:19 is 88.45. For a 30 year-old woman, a 1:13 is 89.34 while a 2:45 is 82.07. So on an age grading basis, both standards for women are comparatively soft, especially the marathon.
If we we were to raise the women's standards to match the men's standards using age grading, we would get new standards of 1:11:30 and 2:33:00 (rounding by a few seconds). Applying these stricter standards to 2016, the women's field would go from 246 (198 full/48 half) to 25 (19 full/6 half).
Incidentally, applying the 2020 standards to the men's field makes it go from 211 to 127 (86 are lost due to lowering the half standard from 1:05 to 1:04).