The Holy Spirit had no dog in the “first day.”
The first day was significant only in numeric order; the sabbath was the worship day, which was transitioned out during the evening after the sabbath, which just happened to be the beginning of the Hebrew work week.
Again, in the light of what He does say on meetings on the 1st day, and the absence of specifically meeting on the 7th, and on what He does on the other 9 commandments, and the absence of any reiteration of the 4th commandment to the church, and of what is said regarding the typological nature of days, then i cannot subscribe to your dismissal.
What makes it worse is that some that those who sanctify the 1st day instead are lost, though i do not know where you stand.