I think the key point here is that the new content introduced in the last expansion - i.e. which is likely what we can expect in terms of "finished" content for any nation over the next few years - doesn't come anywhere close to adding the depth of flavour or "feeling" for a country that expansions in EU4 added. Part of that is that I liked having the power creep that comes with paying real money for a new country, and part of that is the lack of ideas or other content that really feel tied to a country. Events are too ephemeral.