Isn't it possible that the way TSMC is trying to go beyond 3nm is just harder than what Intel has already researched to be feasible and achievable?
Friendly reminder that Intel's node development woes are not over just because they're talking about an aggressive schedule. The node they currently refer to as "Intel 4" is 12 months late relative to their own internal target, and
6 months late to the market. Granite Rapids was initially spotted in their roadmaps as a 2022 product, later made public as a 2023 product on Intel 4, now slated for 2024 on Intel 3.
And that's just the next node, the one after that is deeper in the fog. It may be doing better, it may be doing worse, there's no way of telling because Intel is on a mission of selling the entire world their vision of bringing balance the the semiconductor world. First hey need to get the money, then we get the truth about their real progress (which may as well be on track).