Correct. Most people have location services turned on by default on all apps. I choose to have mine on while using them. See screen shot below.
But even if not, the phone can still be traced via GPS. My phone went missing in the mail, Apple turned it off before it finally got to me. They ship them with enough battery to sustain that until it arrives, just in case of theft.
It was not turned on when it arrived, but it had been wiped by Apple. I have mine turned on too (most of them). If I go missing, it will be quite easy to use iCloud to see where my various devices were during my travels.
However, if the battery is dead, then it doesn't work. I don't think I've ever let my phone battery die. My watch stays charged for 2 days but I put it on the charger every night for 20 minutes, so it never gets close to dying.
All of these habits of Suzanne's are, by now, known to LE.
If the personal item found was in fact her phone, then under what circumstances could that happen, unstaged?
And if it was staged, what does it tell us?
Typically, a person on a bike does not have their phone in their hand while being run off the road or fleeing on bike from mountain lion or other abductor. What event would have given Suzanne time to get off her bike, lean it against a tree, and then walk or run to another nearby place, where she lost her phone?
What if the bike was in a ravine? Then how does the object get to its final resting place? What was Suzanne running from - in any scenario that excludes BM?
And if someone staged it, did they really have a clear idea in mind or were they panicked? Odd that only two things have been found (that we know of).
I think BM must know what the object is, surely.