An optimal filesystem... for what? There is no single filesystem which is optimized for everything, so you need to specify things like cross-platform transpor

An optimal filesystem... for what? There is no single filesystem which is optimized for everything, so you need to specify things like cross-platform transportability, network transparency, hardware interfaces, hardware capability, reliability requirements, cost-effectiveness, required features, expected workload, licensing and what the track record is in the real world.