This way you could set the oven friday morning, and then use it all day long on the Sabbath, without having done anything that fits their definition of work. Then just turn it off once the Sabbath is over.
How do Jews justify wasting so much energy to get around a daft religious rule? If they don't want to observe it, don't observe it, don't just pretend.
I find it a fascinating view of ethics. Christians usual try to reason about why a law was made, and see their thoughts and intents as the primary means of wrongdoing, but while Jews appear to be much more beholden to the letter of the law. Basically Christians believe that sin comes from within and Jews believe sin comes from the outside world through their actions. As I understand it.
https://www.sefaria.org/Shabbat.122a.4?ven=William_Davidson_...
> Are there gray areas, where it is open to interpretation whether or not an activity constitutes work?
Yes, but humorously (IMO) there are those who go to great lengths to create devices or methods that dodge the rules.