Sorry, it’s not hard and I and more than half the engineers in my department did it for 11 months. This probably suprises many people I respect on this board so I’ll go into some detail.
Modern fabs are highly, highly, highly automated with about 2 people for every robot. At one time fabs were close to being “lights out” in the sense lots could run from end to end without human intervention. Fabs are basically capable of turning the lights out today, but quality standards have leapt and continue to increase, so intervention is necessary, to tweak slightly. That is the context in which aggressive WFH occurred.
Fabs did not want WFH because of the model of constant tweaking. But quality standards, as it turned out, were maintained. More than that, quality standards improved; everything got better. Because less tweaking creates a more stable process. This was a big lesson learned, although it is being denied and buried. Then the chip shortage happened and about the same time, Texas fabs had about 2 months worth of production knocked out by 4 days of power interruption.
The response to the chip shortage has been to expand production. This is one area where it is “Tough to run a good fab working from home”. Installing a tool is completely unautomated, and it has created unprecedented demand for contractors. These individuals are plumbers, electricians; basically a different category of fab employee, but very essential. They were never WFH.
WFH fabs had better quality, because engineers were forced to sit on their hands. Expansion has reversed WFH and quality is worse. There is a lot of press about the benefits of work from home, and some of it is clickbait and propaganda, but what I’ve seen myself is that WFH is an improvement and a win-win-win for advanced fabs.