Just my opinion .... and from the view of a potential customer:
1) Roadmap & timeline trust factor
2) Competitive IP concerns
3) Infancy of the use of industry standard tooling
I suspect that many people focus on the competitiveness in the metrics between Intel and TSMC (which is quite normal for a bunch of engineers

).
Once a pilot program is actually in progress, I suspect that other issues will arise that a customer didn't think as much about in the beginning. Issues like the issue process, corrective action process, contractual issues, support structure, etc are things that lots of people overlook in the beginning of a major program, but that hurt like crazy once you are in the middle of it all.