It seems that every recent iOS update turns Bluetooth back on if you had previously disabled it. Why would Apple do this? Kashmir Hill of Forbes proposes that the answer has something to do with iBeacons. follow link
Expand Finder Columns Quickly
Column view in the Finder is great for navigating through your disk's hierarchy, but the columns often aren't wide enough to show the full names of all the files. To expand a column to a width that will show all file names in their entirety, double-click the handle that you would normally drag to expand or shrink the column. To expand all the visible columns to that width, Option-double-click the handle.
Why Apple Keeps Turning on Your Bluetooth
I have spoken with a developer who could not comment but would say that "we were doing what the design specs called for."
For whatever reason, Bluetooth is being enabled after each IOS upgrade I concluded that it was/is a conscious decision by Apple. To what end I do not know. Are there any other preferences or hidden features they are enabling that we are not aware?