Why is LTE in the notification dropdown?

I'm on a Sony Xperia z2 running android 6.0.1 and I noticed the button to enable or disable LTE in the notification bar dropdown, its the same as switching the preferred network type in the settings. My question is why did they put it there? If i have mobile data disabled and LTE enabled it shouldn't make a difference or does it? I currently put both mobile network and LTE out and when i switch off internet i also switch off LTE because i don't understand the logic behind this. Does someone know why?

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