Why?
"What is the technical justification for that ?"
My guess - there is no technical reason, but I could guess at the reason; Google would like you to always have fine location services, wifi and bluetooth always turned on and available so the OS can continuously monitor and report the location of the phone. Some people were turning off GPS/Wifi and Bluetooth when not needed, and so the OS didn't have access to that data, In the guise of security, things were changed so it was all but impossible to use your favourite apps without turning on and crucially, leaving on location services in the hope that people would just leave it all turned on all the time because it is easier. Just my guess.