Separately from the poll: There are clear user experience issues with this approach.
If someone was updating multiple add-ons in one go and all of them used it, the information would end up spread across multiple dialogs and there'd be no shared opt-out preference between them. The information would also only be shared once the add-on had been updated, rather than before to give users a hint about why they might (or might not) want to install a particular version.
At the same time, NVDA offers no built-in support for add-on change logs. If an add-on author doesn't bundle a help file and include the changes in there, it's game over. An add-on you use every day could have many cool new things, and you feasibly might have no idea that they exist.