I agree with what you say about language evolution, but this proposal isn't just about the language—it’s also about APIs, tools, and implementation-specific features (e.g., JITs and GCs), which can evolve more flexibly than the language itself.
Exactly: Diagnosability and serviceability features (especially when deeply integrated with the underlying OS), code generation algorithms optimized for specific hardware, GC algorithms tuned to specific memory hierarchies, etc.