The complex interactions are actually all natural consequences of a language that doesn't even have dynamic wind and exceptions in the first place. Because with 'ccc, people can and probably will build these systems themselves, multiple times, in ways that break each other and threaten to fragment the community... ultimately leading to their standardization. IMO, a procedural language with 'ccc is a dubious start if the 100-year goal is a simpler language than Scheme.