My disadvantages against SSR:
I wouldn't say "have to wait a long time", it's simply not true. Usually the overhead is not bigger than ~200ms for static pages. The issue comes when you need extra API calls to construct your page, but even that case can be handled by injecting the initial responses into your index.html. It's a much cheaper solution and you don't need Node for it.
For SEO there is Prerender.io and similar solutions.
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