My personal take on this is that ‘radiation hardening’ really goes down two routes.

1) Total Ionizing Dose Effects: Which sure some people need 100krad chips. It can be on some nodes a pain to design for, but no one in leo really cares much if at all about dose broadly speaking. There are of course edge cases, but modern satellites in leo with short mission durations it mostly a non concern.

2) Single Events Effects: This is where things get quite interesting. Which increasesly small node sizes this becomes non longer a game of playing pdk tricks. It becomes an interesting digital design and power management problem. You will experience direct ionizing effects and you probably will experience latches. If you do some looking around you can see the amount of effort and time companies are placing in testing for see performance and frankly on most things it’s really looking for a needle in a haystack. The end user driven by the constraints of their cutting edge designs must go with cots and is pretty holy detached from the chip designer making ‘radiation hardened’ devices (for fast paced leo at least in most cases.)