I can't mindread TODAY; let alone go back some 2000 years to do it!
The answer is because there was no controversy. It was as normal for Christians to hallow the 7th day sabbath in biblical times as it is for the Vatican to hallow Sunday today. It was the cultural norm, brought about by the written word of Lord and thousands of years of history and culture. It took hundreds of years to finally stop sabbath keeping among gentile Christians in what became traditional Christianity. And this was only by the traditional church ruling that their word took precedence over God's word:
In the year 365, The Council of Laodicea: Canon 29:
Christians must not judaize by resting on the Sabbath, but must work on that day, rather honouring the Lord's Day; and, if they can, resting then as Christians. But if any shall be found to be judaizers, let them be anathema from Christ.