If diplomacy is naturally oriented towards expansion (which it is, I agree), why is it's medieval tree the most tall focused of them all? I still don't get it. I'd understand Artistry being a be-this-tall-to-ride rollercoaster, but why Statecraft?
Balance?
If you play a small empire, you can take Statecraft to support your diplomatic relations, whether or not you are going for a diplomatic victory. If you don't, you'll have some trouble maintaining them.
If you play a larger empire, you already gain many benefits. You get more diplomatic buildings (so more paper) which scale heavily with CS for some insane per-city yields. More faith output is more religious spread. More spread is more religious authority and more likelihood to pass World Religion resolution. You can fulfill more quests (such as the faith/culture/conquest) ones.
If you were to make Statecraft more friendly for wide play rather than tall, you make it much more difficult to win a diplomatic victory as tall while making it much easier as wide.
Ultimately it's an argument between synergy and support. Just because two paths fulfill the same function, doesn't necessarily mean they need to complement each other perfectly. In fact that's where variation in approaches comes from.
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