If that's all, that's a really good bargain.

A 20% premium for one of the pillars of a modern economy to both repatriate engineering knowledge as well as be significantly less threatenable by your primary geopolitical enemy would be money very well spent.

I wonder if that 20% is a floor or a ceiling too.

Like, as more of the supply chain is reshored will that continually increase cost because reshoring is intrinsically less efficient or will it decrease costs because the increased cost of just reshoring the fab part of the supply chain costs more due to less proximity and integration with the existing supply chain?

I definitely agree, but the next challenge is how to support that long-term investment?

Businesses that rely on the chips will see an increase in cost; and that means passing the cost down to their customers (or having less to invest on their own R&D).