Not really. Well, I think they use Tumblr rather that those other platforms because it's very, very easy to post different kinds of media, and because it's more social than the other two (in the sense of being able to subscribe to people's Tumblrs easily -- all blogs have RSS, but Tumblr packages all your subscribed tumblrs right there on your Dashboard). As for the comments, I'm not sure but I don't think they were available at first. Now they're available but apparently not on by default, and I suspect people are used to using Tumblr without them so they just don't think to enable them.
ETA: Actually, you have to kind of hack comments in by adding Disqus, and not all themes support it. So, yeah. Most people aren't going to do that.
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branchandroot
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Date: 2011-10-13 09:11 pm (UTC)ETA: Actually, you have to kind of hack comments in by adding Disqus, and not all themes support it. So, yeah. Most people aren't going to do that.