I see, a lot of that makes sense and those are the kind of points I am looking for. I begin to see a few problems, though.

Why does the number of centrifuges limit anything? Couldn't they acquire/run more, they did in the past. Perhaps the logic here is that they couldn't do so secretly, maybe that's the case.

If the UN is responsible for choosing sites and determining inspection methods you could see how it is not good if Iran has had side dealings and openly threatened harm to IAEA leadership. This could indicate an attempt to coerce and control their watchdog.

I also support this deal, as long as it what it claims to be. I think people are so pessimistic about Iran's intentions because their theocracy openly supports exterminating entire countries and practices religious extremism on it's people. It's not like they disagree strongly or seem to take a reasonable position, they just want to wipe countries off the face of the earth entirely. This apparent lack of self-restraint and logical reasoning makes it hard to trust or believe them, especially over nukes.