As an Orthodox Jew who observes the Sabbath every week, while sometimes finishing up work and preparations beforehand can be stressful at times, there's no feeling like turning off all phones/laptops/etc Friday evening and leaving it all behind. There's a supreme serenity that comes with the knowledge of "I can't do anything about it, so there's no point in worrying". As soon as Sabbath starts I'm totally focused on…
I'm Jewish but not religious anymore, and I know a lot of people that keep Shabbat that talk like this. Frankly, I don't buy it. If we have a problem with detaching from technology, then, stopping all usage of it only one day a week is maybe 90% as unhealthy. It would be like saying you have a healthy relationship with smoking because you don't smoke at all for one day a week, but after that you can chain smoke 24/6.…
I think you're letting the perfect become the enemy of the good.
Also, very intentionally keeping a day per week free of technology may help cultivate the skills necessary to keep it under control for the other six days. It would certainly keep it from becoming an all-consuming habit by providing regular opportunities to re-evaluate.
I'm reminded of a story a landlord told me: he didn't typically offer his tenants yearly leases. Instead he'd provide a six-month lease that would allow them to continue month-to-month without any extra fees. Why did he do this? Because the ritual of regularly renewing a lease prompted his tenants to reflect on if they wanted to continue to live in his building at all, and many would leave for places that suited them better. Removing that ritual encouraged his tenants to coast and stagnate, so he had to do much less work less to keep is building full and the rent checks flowing.