Every generation credits itself with some form of unattainable stoicism and yet progress marches on. I have no problem believing in 10x developers, but in my experience it’s always been down to hard won knowledge of the right architectures, libraries, data structures and algorithms. This helps to reduce suboptimal design and rework, allowing one to make constant, confident progress. It’s no wonder that older, more experienced devs often have this knowledge, but it’s not impossible, nor even very rare, for current and future generations to acquire it (even during their much-maligned Computer Science degrees).