I can agree with you as far as you go, but the Sabbath means more than that. It is a memorial of creation and we're told it means much more to us personally.
I know you'll object to this having any meaning to us because we aren't Jews but that is not how I read the Bible, It is all applicable to us just like the following is.
The Sabbath is depths more. It is a memorial of creation so it's meaning is rooted in creation and it is creation that defines the Sabbath, not the 4th commanment which is absent in creation.
So what does creation tell us? Sabbath is the culmination of the days of creation and the antithesis to the chaos before God spoke light. This is in plain sight from a comparison of the 7th day and before day 1 but also far more explicit as it is a direct parallel within the chiastic patterns of the account. Before day 1 explicitly parallels day 7 and this is intentional and teaches us what day 7 accomplishes.
Day 7 is in fact the answer to the darkness and chaos of before day 1. It starts when light is separated from darkness which begins a work that when finished ushers in the 7th. Day 7 is the completed work of God in creation and it is the completed work of Christ in the new creation and the ultimate meaning of both Sabbath and creation.
Every word is still important and still has meaning for our lives today as it points to Christ. The 4th commandment points to Christ and the 7th day points to Christ. Christ is the emphasis and the message of the Sabbath and Christ is the Lord of the Sabbath. Where rest is important for healthy living the Sabbath is not actually about physical rest, physical rest is the mechanism the Sabbath uses to testify Christ and his spiritual rest he offers. It's true meaning is and always was the spiritual rest or the answer to the darkness.
We may continue keeping the 4th and this certianly can be a part of a healthy physical and spiritual life but not at the cost of the gospel. Christ says we may break our rest to do good and this is a part of a greater picture of love such as what we see in the law of love Christ unpacks as well as parables like the good Samaritan.
The good Samaritan is a unique account showing how those who should have did good actually avoided it and the unexpected was the one who was the neighbour. I can't help but compare this to religious Sabbath practice today, as the spiritually lost may be in need, perhaps not in physical distress but certianly in spiritual distress. Yet on the Sabbath, the day meant to glorify Christ and point to his spiritual rest, we limit the love we show because we deem it as work and a sentiment of "any other day but today". So cross the peverberial street to avoid doing good if it is deemed as breaking our rest without just purpose. What's the purpose? To show Christ's love... Is there any greater purpose?
This is putting Sabbath practice above the gospel but we should be quick to break our rest to show love because the latter is more important as the latter may be the access into giving others spiritual rest.
Jesus says it is lawful to do good on the Sabbath. I don't see this as something we may opt out of. There is the cry of bleating sheep trapped in pits surrounding us but we are too busy resting to notice. Don't break rest to violate the Sabbath which is the wrong focus, break rest to glorify God. We already have the spiritual rest, so showing it to others should now be our priority and we may break physical rest to do this and this should be called good.