I am unsure as to whether this thread has been written by those with a US or UK education in English (I am UK educated), however, I too feel that to write, and hence communicate effectively with another, one should endeavour to create flow and understanding of the text. This is done by the use of good grammar. Good grammar facilitates understanding by the reader and enables the writer to convey her thoughts more accurately and without misunderstanding.
I believe this is especially true if one is writing for a readership that is beyond her immediate local accent and dialect.
If ah was t'write as ah speak, in me broad Yorksher aksent, then it wud be difficult fer uthers t'understand what ah was on about. butalsoifididntusegrammaritdbeevenworsewithnospacesfullstopscommasorcapitalletterstodefinethetext.
Another thought: if books and periodicals were written in "textese", how would we ever understand the nuances of more complicated concepts and ideas? The mind boggles! Are tomorrow's thinkers and writers going to be in such scarcity because increasingly fewer people will able to communicate well?
CC