No because you can't make sure that the phone is of without removing the batteries which are glued in between sheets of glass.. 


Furthermore it could be remotely turned on again.  

 So the towers can triangulate you even when your phone is turned off, only if it’s not ACTUALLY turned off. I am understanding this correctly? 

 Yes. It might not actually be turned off even if the screen is „black“. 

 Additionally, take a look into apples find my network and googles equivalent. 

 What about it? Are you suggesting that Apple devices are en masse not fully turning off, for the sake of “Find my iPhone”? 

 I think there is conceptual “off” and then there is physically “off”.   I guess the insinuation is that concept “off” may just be the device placed into a very low power mode.   

 ….even iPhone has a mode where it appears “off” but is still locatable using the Find My iPhone feature.   

 I'd like to see more information about that, too. 

Seems unlikely, as communicating on the cellular network takes quite a bit of energy. So even if "off" is really "low power mode", I'd like to see some experiments that verify what's happening. 

This is one of the reasons why the older phones or few available current models with removable batteries may be valuable.  

 It's legit and baked into all BLE (Bluetooth low energy) device hardware.