TSMC says AI hardware is getting so complicated that chip packaging can no longer be developed or tested in isolation — a positive sign for demand, but a warning about supply bottlenecks.

• TSMC's advanced packaging arm is adding system integrators to its 3D IC alliance for the first time, because AI chips now stack so much memory and logic together that testing a component on its own no longer proves it works.
• Business in advanced packaging is growing strongly, and equipment makers are under constant pressure to deliver machines faster.
• Squeezing a new generation of technology into every year is too fast for the old step-by-step approach, so development now has to happen in parallel.
• The weak link is the humbler stuff: substrates and printed circuit boards are in short supply.
• Taiwan's dense chip supply chain is being pitched as the place to close those gaps through a shared platform and common standards.

Outlook: Expect closer tie-ups between chipmakers, packagers and system builders over the next few years, with substrate and PCB shortages the main thing holding AI hardware back.