Because it take 2/3 rds of the states to ratify anything that comes out of it.
Unfortunately, to me that begs the question; will 2/3 of the legislatures always be right leaning? Amendments can take years to ratify. Let’s say an amendment to make abortion a “right” is passed by an article V convention. That goes out for ratification. The leftists pass it in Left States and delay in States that have right leaning legislatures until they can (hopefully, on their part) get a majority and pass it.
I would dearly love a balanced budget amendment but I’m still afraid of a hijacked convention. (off on errands, will check back)
3/4ths are need to ratify.