I see your point, but I think First Age Beleriand does a fine job of displaying different nations, better than Third Age at least.
Ther are the Sindar and the Noldor, and even the Sindar are divided in Elves of the Falas and those of Doriath. None of the Noldor are allowed into Doriath except for the few of Finarfin's House, and rarely did they associate with the elves of the Falas and later Balar. Also, the Green-Elves of Ossiriand didn't concern themselves with the troubles of the other elves except for the one instance they helped Thingol. Then there is Gondolin and the settlements of Feanor's son's. Both are Noldorin, but each has a sense of unity and loyalty. The Gondolindrim would be considered an extreme case of an isolationist type nation something like Japan was during the 19th century. And the Feanorean settlements didn't associate with the other Noldorin settlements very much not to mention the Sindar.
Dwarves are dwarves? Surely dwarves would be excited to see each other when the original dwarf colonies were so spread out, it would be refreshing to know that there are others of your kind out there. Granted, Dain came to the rescue of Thorin at the battle of the five armies, even though Thorin was living in the Blue Mountains at that time and Dain in the Iron hills, but they were both Longbeards, and from Moria originally. Also, did you overlook that Belegost did not come to the aid of Nogrod when they went to battle with Doriath. I would consider this very similar to the nations of today, or middle ages. The dwarves of Belegost made a very political decision here.
No time to for anything else, maybe later.
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