Men, proud of their wisdom, have for many decades, declared that Ark steadying means you should not attempt to change or find fault the church, or question its priesthood leaders.
What was Uzzah steadying? The throne of a man? The programs of the synagogue? What did the Ark contain and what was it a symbol of but that Law, written by the finger of Jehovah himself amidst the earthquake, fire and smoke of Sinai.
The scriptures in many places declare that the members are to judge those that are higher and they are liable and even likely to fall. For instance D&C 121:34-46, Mark 9 Inspired Version, D&C 107: 82-84, D&C 28:13, D&C 104:71. The Lord built church steadying, and priesthood steadying into his church. For men are imperfect and need steadying no matter their station. Men's knees often quiver, buckle and bend when it comes to keeping the commandments of God. "Its too dangerous!", "Its too offensive!", "Its not practical!" or "It does not apply to our day!" Instead we have turned the infallibility of God on it's head, declaring that man is infallible and God needs correcting!
King David, in his folly, instructed that the Ark should be transported via cart pulled by oxen. Uzzah, being of the priestly class, should have known better for the Lord specifically commanded that the Ark was to be transported, via poles, upon the shoulders of the priests. However, preferring the instruction of his priesthood leader to God, Uzzah was struck dead when it went wrong. And what do we read but that David felt personally responsible when he heard what happened and admitted his error.
Ark steadying refers to any man, especially one called of God, who trifles with His laws.
"While that man, who was called of God and appointed, that putteth forth his hand to steady the ark of God, shall fall by the shaft of death, like as a tree that is smitten by the vivid shaft of lightning." (D&C 85:8)