I would consider my Read Write Respond site as a ‘blog’, but agree with you that my Collect site is not really a blog. In some respects I would be happy enough to make it private is it is primarily my own secret garden with the gate left open. This is why I curate my monthly newsletter. It is a habit which I find forces me to look back through all the noise. I think this creates a clearer narrative to pick through than my multitude of links.
Although I believe in webmentions as a way of commenting on other posts, one of the reasons I have not made more of my posts private is because I like using Webmentions to connect pieces within my own site. This was brought to a head this week when an update seems to have updated my settings to say no self-mentions stripping my site of all my own self-webmentions. This has force me to consider what I want from my site, even more so after reading your reflections.