complete grammatical "sentence"

There are no 'partial' grammatical sentences.

at least by
1993

Your meaning is "as early as 1993".

";that, and ...."

Referential demonstrative pronouns after a semicolon are NOT grammatically correct.

The important thing is communicating
one's meaning.

Grammar is a critical tool in communicating meaning in all languages. Once it is mastered, capable writers can and do choose to 'break the rules' to express subtleties of meaning and emotion. It is very easy to distinguish when correct grammar is being calculatedly avoided and when it is being ignorantly mishandled.

the English teaching and writing community

If there were such a community, you would be required to wear a scarlet letter.