[hello_hello]

If you bob-deinterlace a progressive source, the field from each frame becomes a full frame, so from a motion perspective, nothing changes.
A B C D
becomes
AA BB CC DD
at twice the frame rate.

It won't help if full frames are repeated.
A B C C D
becomes
AA BB CC CC DD
at twice the frame rate.

For a telecined source it's better than field matching without decimation. For standard 2:3 telecine, field matching gives you something like this. One of the "B" frame fields is repeated, and one of the "D" frame fields is repeated, but for each group of five frames, field matching throws one repeated field away, and the other repeated field is matched twice to invent a duplicate frame.
A B C D D
whereas after bobbing you'd have
AA BBB CC DDD
at twice the frame rate.

In a perfect world you'd field match and remove the duplicate frames as it gives you the original progressive frames untouched, and of course for standard telecine that takes you back to 23.976fps. Bobbing re-imagines every field into a new full frame, so there's no original frames left, but sometimes, especially for hybrid sources, bobbing is a simpler way to do it, and looks smoother than field matching without decimation.
For your source bobbing must still be creating a group of three repeated frames instead of two now and then, but not as often as for standard telecine, where there's more repeated fields.