For context, the "load times" we're talking about in the context of Disqus, at least the ones given in the articles I've read, is about 3 seconds. What's more, the javascript is below the fold, so you've already read the site content before seeing the unloaded comment section anyways.

I find it very hard to get worked up about 200k and 3 seconds of nonblocking load.

The tracking is of more immediate concern, but you also have to make a choice as a site owner:

1. Host your own comments. Nobody does this anymore because nobody likes registering for every site out there. You can have anonymous commenting, but ++ abuse. Either way, spam concerns are completely on your shoulders, and you still have to moderate.

2. Shell out to Disqus or similar. People get to log in with the credentials they already have (and don't have to log in at all if they have cookies from using another Disqus site), moderation is still a thing, but spam is much less of a problem.

3. Not have comments at all. An increasingly popular option.