Every time I have to go into settings to specifically turn OFF bluetooth so that iOS doesn't turn it on the next day, I get annoyed. We used to be able to turn this off via control center. Apple: This is not progress!
Regardless of the consumption and impact of leaving it enabled - which might indeed be minimal - there is absolutely no logical advantage or explanation for the nonsensical change Apple seems determined to resolutely implement.
Likewise with the battery stats category modifications.