Thank you so much for going to that effort @lindaloon. The NCCN site is very useful for all of us (I used it 10 years ago).

I think that the fact that you have DCIS accounts for your doctor saying your endocrine therapy is optional. (Sorry I missed the DCIS in your first post!)

There is an Oncotype test for DCIS that would give you risk of recurrence and a number for benefit from hormonal meds. That info might be helpful.

ps For invasive cancer, the guidelines are clear:
Targeted Therapy
All patients with HR-positive IBC are recommended to receive endocrine
therapy sequentially after completing the planned preoperative systemic
therapy.