Intel was trying to change up a lot more things with 10nm than is normal for a node shrink. I believe I heard the switch to Cobalt was still the biggest challenge. Realistically Intel shouldn't have been so aggressive, instead choosing to do a standard 10nm shrink and then a 10nm+ with a switch to EUV, then something like a 10nm++ with a switch to Cobalt. If Intel had gone a more normal route, we probably would have had 10nm+ with EUV this year and Cobalt would have been on the books as a next year upgrade. Once they had mastered all those things separately, then jump over 7nm and go straight from 10nm to 5nm with their knowledge in hand.