Google Accelerating New Android Versions

Carriers however, will do their best to delay any updates for as long as possible. Even going so far as claiming that a specific device doesn't get the same features or update as a competitors same specific device. Think T-Mobile vs ATT LG G2 device back in the day. One could be upgraded with VoLTE the other not, even though both were the same model.
Google could put out updates daily and carriers will wait months or even over a year to put it out.