I hear all your arguments above, but I just disagree with your fundamental premise that if a so-called OP item exists in the game it will unavoidably ruin the game for a significant enough number of players such that the item should be removed.
While the following is not a blanket statement that I would apply to absolutely everyone, I trust that there will be a sufficient number of players who can and will be sensible enough to use a so-called OP item in ways that keep the game enjoyable for themselves and their own particular level of skill - all the way from not using the item ever, to using it on every mission.
We simply have fundamentally different views on people’s ability to exercise self-restraint and knowing themselves well enough not to inadvertently ruin the game for themselves. I think it’s an agree to disagree situation.