Neither does soft wrap play nicely with preformatted texts (e.g., ASCII graphics, including diagrams and ornaments such as titles centered with spaces, as well

Neither does soft wrap play nicely with preformatted texts (e.g., ASCII graphics, including diagrams and ornaments such as titles centered with spaces, as well as formatted code). And the support for soft-wrapping in tools varies: it may be completely unavailable, or just turned off by default, and generally unused in such a case. I think reflowable text enters the area of markup languages, rather than plain text.