Except that is the opposite of Frost's meaning of the poem.
Not really. Frost was just questioning the purpose for repairing that particular wall, since it served no useful purpose of keeping something in or out like cows. He had no problem with walls that are there to do a job, saying that before he built a wall he’d like to know just what its purpose was.
He was also questioning the merits of his neighbor rebuilding the wall each spring, simply because his father and possibly grandfather before him had done, not seeing the essential vanity in doing something simply because it had been done for decades.........