Many women can easily tolerate AI. My sister was on one for 10 years--pre-menopause--with zero symptoms. I've been on letrozole since November with only a few mild hot flashes. Why not start on an AI and then come off it if intolerable? It is worth giving it a shot, I think, sit is a good defense against breast cancers.

Yes, I believe it is the warning bell. Because it is a pre-cancer accumulation of cells. The link above talks about intensive monitoring.
Yes, AI drugs can reduce your quality of life, then again, many women take them with no trouble at all. Cancer can certainly disrupt your quality of life too, if you land in that 15% . My risk of getting breast cancer was around 3%, that didn’t matter when I was going through chemo.
Every treatment decision has to be a cost vs. benefit decision for each person.
Talk to your doctor, find out your options, then at least you can think about what is important to you. Age can be a big factor in deciding this. If you are 35 that 15% might feel different than if you are 75. How active are you, and how active do you plan to be. None of this is easy, sigh.
Do you have an appointment to discuss your options with your doctor?

Yes I’d say you continue to monitor closely. ADH is not cancer. It’s abnormal cells but it’s still a few steps away from actual cancer.