[teraflop]

If you recognize that sign languages such as ASL are distinct languages, as linguists do, then it naturally makes sense that native speakers of those languages would want a way to write them down in a static symbolic way, for all the same practical reasons that we use the Latin alphabet in English.

For instance, being able to quickly scan through a piece of text instead of having to watch it play in video form, or being able to search and index it, or providing a way to organize dictionaries.

There's no inherent problem with using the same notation scheme for different sign languages, just like we use essentially the same alphabet for English, Spanish, French, German, etc.