Breast Cancer Stage 1b --how much is just too much?

Background on me--I eat very well (clean eating, no soy, hardly any gluten, no high fructose syrup, no dairy) and go to a DO (vs MD).

I knew I had an issue when the breast spot dimpled and felt a lump under by armpit after COVID (lymph node). Nothing found on mammogram, demanded ultrasound and invasive ductal on breast and similar on lymph node -stage 1b (bc metastasized to sentinel lymph node), both spots fairly small 1.8 and considered a 1 for agressiveness.

Initial thought was --ok, l will get lumpectomy and the 1 lymph node removed, maybe a little radiation and should be good..afterall still stage 1.

Then the appt with the breast specialist/surgeon --she is talking about taking out all lymph nodes with a 30% chance of permanent arm issues and 6 weeks of 5day radiation and possible chemo ..which I'm not going to do because as I pointed out there was little bang for your buck on estrogen and progesterone positive receptors with HER2 positive (2) and FISH negative. After several questions, she concurred with it will likely not help with my type of breast cancer. My husband and most of my family members agree that they usually go over-the-top on stuff---make you miserable with lasting mental health and physical health issues long term.

My thoughts..
Why can't they simply do more test to determine if those 'other' (oustide of sentinel) are cancerous, instead of just saying it is fatty tissue and will just remove all when there is a 30% chance of arm problems.

Why recommend chemo when it doesn't typically help and my spots are small.

Why over 30 rounds of radiation that can leave my breast blackened (permanently) when it may not even be needed --how about scans and such after I get surgery and maybe a few rounds of radiation.

Thoughts on the ole 'let's just do xyz just in case' medical practices and your experiences.