What was the point of removing the gba slot from the 3DS?

DS Lite to GBA Tutorial Part 3 of 3 ds lite gba slot Lost your NDS Lite SLOT-2 cover? Here you go ds with gameboy slot So I l'm curious as to why my DS Lite's GBA slot cover has gold pins on it, if it's just a dummy cartridge to act as a dust cover and to

ds99 slot GBA SP CleanScreen Kit Game Gear GameSlot Kit SKU GG0043 £