Being lazy has its advantages
I used to feel so lethargic taking dictations from the teacher as he/she droned on and on (especially after lunch), I would do a lot of on-the-fly editing to reduce the writing work. Being a slow writer also necessitated it. Call me pompous, but the lossless compression (!) would be flawless and generally better grammatically structured. The short cuts had actually become a habit later on and helped hone my writing skills.