Indeed, because shades of compliance is something to work with in the context of an agreement where there are incentives for Iran to be compliant. Outside of that framework they don't have to comply with anything.
Gladly, and we'll start off with a graph illustrating exactly when I'm referring to.
On the lower right side of the graph you'll not the uranium enrichment levels which were within the compliance levels. You'll note from the center of the graph moving towards the right are Iran's enrichment levels post US withdrawal, which also ended the wider transparency inspectors had to their facilities. Iran did have a covert program they didn't disclose to the IAEA as they should have, but the question is whether it made more sense to hold them accountable for that within the deal framework versus taking the approach the Trump administration did back in 2018. Clearly the Trump administration's strategy of sanctions as a deterrent failed miserably since not only did Iran ramp up their efforts, but also at higher enrichment levels.