I would tend to agree with you. Although I understand your surgeon's concern about widening your lower face, it appears that a more extended anatomic shaped implant may have been a better choice. Of course it is easy to be a "Monday morning quarterback" and I hesitate to make a criticism, since I have not examined you. My answer is solely based on your photos and your comments. I would address your concerns with your surgeon.
Chin implant not right shape
I perform a lot of chin implants and do use the extended anatomical implant most times. This is strictly a preference of mine; and the button implant may be the preference of your surgeon. I believe the width of the extended anatomical implant will not change the apple of your cheeks. Best to discuss this in detail with your surgeon.