But the whole point is that it depends on your approach. Jesus was very clearly in opposition to the religious elites of his day by choosing to walk, teach, and even perform physical healings on the Sabbath. The summation of the rationale for this is pretty clear: it is lawful to do good on the Sabbath.
He didn't call it legalism, he called it everything from hypocrisy (heaping up burdens on people) to simply evil (neglecting elderly parent for the sake of ritual).
I think all I'm saying is that there's a middle ground where you go screen/internet free, and avoid things like housework, shopping, planning, and meal preparation in favour of spending time with family, but don't sweat things like non-religious reading, turning lights on and off, and walking to the park.
Well, some of the Protestants do still observe the Sabbath (generally anything with 7th Day in the title). Those that observer the Lord's Day are not quite as strict about it.
https://www.biblegateway.com/passage/?search=Matthew+12%3A9-...