When it comes to AT&T and Verizon, it’s actually not removed but hidden. Apparently, the feature can be brought up using a third party launcher to create a shortcut to the hidden feature. It can then be enabled and used, though to what extent is unknown. Some report that it helps with SpeedTests and Play Store downloads, though it may not properly enable during file downloads. For full functionality, root would be needed to fully enable it, though there is no root exploit for the devices yet.
Though it’s not a sure bet, it’s great that it can at least be partially used without needing to root and modify the device. Though the feature shouldn’t have been removed in the first place, this is the next best option. Give the method a try and tell us how it works for you in the comments!