Other questions:
Q: “What will the delegates propose?
A: Some good things and some bad things.
Q: What happens then?
A: 3/4 of state legislatures would have to approve.
Q: Will they repeal the 2nd amendment?
A: IF (big if) such a thing was proposed, 3/4 of States would never ratify it.
What else are you worried about?
The Articles of Confed required unanimous consent to reform. The Constitutional Convention altered the terms of ratification to 3/4ths of states.
You hold out ratification as an immovable check against overreach. Ironic since it’s current form is the result of moving the goalpost on ratification.
More to the point, the chief problem with COS is this insistence by its supporters that people used to making the rules will actually follow the rules as written. The folly of that thinking is if it were true, a COS wouldn’t be necessary: the Constitution as written would suffice.