These are all good points and I think there is substantial evidence to support the majority of them. Quick tangent: I’m not so sure about your dismissal of the link between voters selling votes and a lack of service provision as there are several places in which selling votes often occurs as an inadequate form of exchange and/or a way of reallocating finances to allow for the purchase of goods.
Regardless of that minor detail, I’m more or less in agreement with this framework. It gets a bit more complicated when you introduce alternative systems of collective action and coordination in non-democracies, particularly as many contemporary autocracies have become more adept at using technology to both restrict voice through both repression and targeted goods provisions.
As you note in your later comment on Vietnam below this reflects the wide array of non-democracies and the relative permanence of current regimes/systems. If you do write a blog post I’d be curious to know from an EA perspective (and your perspective) what countries/systems could see the largest gains in quality of life/life years added by inducing transitions to more inclusive forms of governance. Do these match with the countries/systems most susceptible to transitions?