Using "LEN'TH" to abbreviate "LENGTH" is really hilarious (or I am fundamentally misunderstanding something). Why did they not adjust the tracking as in "PLUS"

Using "LEN'TH" to abbreviate "LENGTH" is really hilarious (or I am fundamentally misunderstanding something). Why did they not adjust the tracking as in "PLUS" vs. "MINUS"? Maybe they already reached the minimum in "LEN'TH". Fun stuff.