Apple had also removed another iconic feature that existed since 1984.
They had replaced USB ports, MagSafe, Apples iconic glowing logo with a TouchBar.
Apples had decided to remove the distinctive nose that Mac Computer makes when they boot up.

The new MacBook Pros lack the iconic Mac chime when booting up.
The startup chime was been there from 1984 when they revealed the first Super bowl commercial.
Pingiefirst noticed that the Macs Startup Chime was gone while browsing through sometech notesfor Apples new Macbook pro.

Hold these keys down for at least 20 seconds to ensure that your Mac completes the process correctly.
The new Macbook Pro no more directs the user to listen for two startup chimes.9to5Macalso confirmed the story.
The new Macbook Pro actually automatically turn on when opened.

The possible reason behind eliminating the startup sound is to prevent an interruption.