fix: Clarify why infostring default is deferred

Author: epage

text/3503-frontmatter.md

@@ -453,6 +453,7 @@ pprint([(k, v["title"]) for k, v in data.items()][:10])
 [future-possibilities]: #future-possibilities
 
 - Treat `cargo` as the default infostring
+  - Since this is a one-way door, we want to make sure we are confident that that is the right default / policy
 - Support more infostring languages
   - We need to better understand use cases for how this should be extended
 - Support infostring attributes