Re: Well at 3nm it's a case of...
The issue with sub-10nm tech is not the possibility to etch it - that can be done. The issue is with long term stability of the product. When you have a feature which is less than let's say 50 atoms wide, a couple of atoms popping out of their places in the crystal lattice or swapping places with their neighbours is enough to turn the cart.
Atoms are not electrons, they do not move around easily. However, they do too. It is simply a matter of probability and some heat.
So while adding more transistors, etc 3nm smells like adding some planned obsolescence too. 28nm chips can run for decade(s). It is the capacitors which give up the ghost. At 3nm... Dunno... If it is regularly running at 70C+ (fairly common in a CPU under load) I have some doubts it will survive for more than 5-6 years.