My issue with it was that it squeezed the wrong end of the amendment "funnel". It makes it harder to propose amendments. I don't remember a frivolous amendment being proposed.
Instead, i would have preferred to see a bill making it harder to pass amendments, moving it to 60% or something similar. That said, a lot of the progress the state has had would have failed under either requirement. Min wage increase, end of life, recreational pot, etc.
I have never said to myself "wow, we propose and pass a lot of amendments that should never have seen the ballot in the first place". And if we did, i want to see the ideas. Keep proposing easy and make them need more voter backing to pass.