Startup Chime: What Does It Mean?

see >About Mac startup tones - Apple Support

About Mac startup tones

Learn about the sounds your Mac might make when it starts up and what these sounds mean.

Mac computers (except MacBook Pro models introduced in 2016) can produce several sounds when starting up. Your Mac should produce the familiar chime on start up.

If you hear one of these tones, it might mean there's a problem with your computer:

• One tone, repeating every five seconds: No RAM is installed.
• Three successive tones, then a five-second pause (repeating): RAM doesn't pass a data integrity check.
• One long tone while you hold down the power button: An EFI ROM update is in progress. This applies to computers made before 2012.
• Three long tones, three short tones, three long tones: EFI ROM corruption is detected, and the computer is in EFI ROM recovery mode.

The startup chime indicates that your Mac has successfully passed POST, Power On Self Test.

So basically if I want my Macbook Pro late 2016 to have custom startup sound, I should stop dreaming? Why does Apple do this? Also, I want to get the glowing Apple logo back.