Yes. My understanding is that is fairly standard. ILC is tricky and they like to hit it hard. You also had four tumours. I had IDC, no spread, and after a genomic test to see if it would be beneficial, did chemo. Because of a bad family history I then went on to have a bilateral mastectomy (and recon). I am on estrogen suppressing meds for 5 - 10 years. The latter is what I would be querying. As your onc why they want you to be on it for the rest of your life. Breast surgeons are not oncologists and sometimes get the finer details of endocrine therapy wrong!
And welcome to the forum. I'm sorry that you've joined us but I hope you find it as helpful and supportive as I have. K xox