I feel that back in the 80s QNX had already accomplished what Hurd had set out to do (https://blackberry.qnx.com/en/products/qnx-everywhere https://blackberry.q

I feel that back in the 80s QNX had already accomplished what Hurd had set out to do (https://blackberry.qnx.com/en/products/qnx-everywhere https://blackberry.qnx.com/en/products/qnx-everywhere). Blackberry bought QNX decades after its creation but the core architecture - microkernel-based, modular, and real-time - was already mature and production-ready long before Hurd left the lab. Moreover, I've never known another OS to implement synchronous thread message passing the way QNX does.