China's YMTC targets 70% domestic chipmaking tools, but advanced NAND still has foreign dependency

YMTC's 70% domestic equipment target is less a strategic choice than a forced convergence under BIS restrictions. The real bottleneck isn't procurement ratio—it's process window. Above 200-layer 3D NAND, high-aspect-ratio etch uniformity, CD-SEM metrology, and overlay control still carry a one-to-two-generation precision gap versus KLA and LAM. Lines get assembled, but yield ramp cycles run six to twelve months longer than Samsung or Micron. That delta is the true cost sink, and the reason domestic TCO sits 15 to 25 percent higher. Strategically, Micron and SK Hynix will exploit this window to push nodes past 300 layers, converting a catchable gap into structural lag. Meanwhile, AMEC, Naura, and Tuojing gain a rare forced-validation scenario—customers aren't choosing them; they're constrained to them. No market education is more efficient than that, and it compels quarterly-level precision iteration on the domestic side. Over the next 12 to 24 months, expect a dual-track reality: sub-192-layer lines trending toward full domestic stacks, while 232-plus layers retain mixed configurations. The inflection point isn't procurement percentage—it's whether domestic metrology and thin-film deposition clear the 200-layer process validation threshold by 2026. Miss it, and 70% is a balance-sheet number. Clear it, and it becomes genuine technological sovereignty.