Because as the lane is ending, the entire distance from wherever you are to wherever the lane ends is an opportunity to merge without disturbing other traffic. When the lane ends, that moment is now forced, leading to a higher likelihood of the driver(s) behind having to brake more abruptly and/or to an even lower speed.
Because as the lane is ending, the entire distance from wherever you are to wherever the lane ends is an opportunity to merge without disturbing other traffic. When the lane ends, that moment is now forced, leading to a higher likelihood of the driver(s) behind having to brake more abruptly and/or to an even lower speed.