Why is everything in aviation written in abbreviations? please tell me if there is already a duplicate, I could't find one.

Why is like everything in aviation written in abbreviations?

ACARS Message:


  /WND 275057/MCH 81/TRB LT CHOP /SKY UNDERCAST/ICE NONE


Why don't they just write:


  Wind: 275 at 57 Knots. Light Turbulences. Not cloudy, No ice.


And also in the cockpit

HDG, SPD, ALT, LDG GEAR.

Of course, I know, its shorter and faster to read, but wouldn't it make such a bug difference if you write "Heading" instead of HDG?

Thanks, Noah
For the weather, those come from ye olde days of teletypes when it took a significant amount time to transmit characters. Yes, they should go away.