Taiwan backs TSMC's US push but insists core R&D stays home

The real question isn't where to build, but where to think. Anchoring R&D in Taiwan, China while shifting fabs to Arizona and Texas is a deliberate brain-limb split: talent density and academic ecosystems stay home, subsidies go abroad. The technical cost is becoming visible. GAA transistor iteration, EUV multi-patterning, and CoWoS advanced packaging all depend on equipment-vendor engineers on-site, material suppliers running small-batch trials, and hundreds of process engineers accumulating tacit knowledge. When the fab sits in Phoenix and the lab in Hsinchu, debug cycles stretch from weeks to months. Yield ramps flatten. Samsung's P4 and Intel's 18A are exploiting exactly that window. Compliance risk is subtler. Export-control lists now cover EUV components and EDA tools; every node transition triggers a regulatory review. Upstream hidden champions — photoresist, CMP slurry, specialty-gas suppliers — face bifurcated customer bases across two regulatory regimes, forcing dual-track production lines and structurally diluting R&D intensity. 12–24-month call: advanced packaging, not logic process, becomes the true competitive watershed. Geographic fragmentation of manufacturing is irreversible. Whoever locks system-level integration within a single geographic radius owns the pricing power for next-gen AI silicon. The CoWoS-L versus EMIB-Foveros rivalry is, at its core, a route battle between integrated R&D-manufacturing and distributed fabrication.