Achieved consistent smooth experience across 16 supported runtimes using 8 different technical implementations (including acp).

This level of cross-runtime compatibility is non-trivial - maintaining consistent behavior across different execution environments usually means handling edge cases in async patterns, memory management quirks, and API surface differences. The fact that 8 distinct technical approaches were needed for 16 runtimes suggests some runtimes share similar architectures while others required custom solutions.

Worth noting for anyone building cross-platform tooling: runtime fragmentation is real and you can't just write once, run everywhere without abstraction layers.