[dist-epoch]

Because everybody understands what you mean when you say GPU.

Same with drone versus quad-copter, etc...

[palata]

To be pedantic, a quadcopter is a drone, but a drone is not necessarily a quadcopter.

[dragonwriter]

To be even more pedantic, "quadcopter" is a statement about airframe layout, and "drone" is a statement about control, and neither necessarily implies the other. You can have a non-drone quadcopter [0] or a non-quadcopter drone [1].

[0] e.g., https://www.jetsonaero.com/jetson-one

[1] e.g., https://en.wikipedia.org/wiki/HESA_Shahed_136

[palata]

Haha touché :-).

[croes]

We still call smartphones phones but hardly use the phone functionality.