Actually, I'm MUCH MORE annoyed by the "adoption rampage" we see.

That people were commonly adopted in Roman times is fine. It was the norm by then.
But it's NOT the case in medieval time. I like how you worked to preserve your bloodline in MTW, the birth of a new heir was really something to be celebrated.
Now in MTW2 you crumble under the number of adoptions, it just feels ridiculous.