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Second, Google only surfaces the big platforms any more.
As for your second point you're probably right, it depends on what your intention is with your blog. I wouldn't mind having thousands of people read mine, but I personally think it's eventual as long as you're a good writer and hang out in relevant communities, but I guess it makes sense from an SEO pov.
I've always thought of blogging as just writing a note, dropping it in a bottle and tossing it. No idea what happens to it once I post it.