Unanticipated benefit to microblogging on my own site and syndicating to Twitter, versus just posting in Twitter: posting is separated from consumption. When I have something on my mind, I can publish it without getting sucked into checking my feed & notifications.
To post from a browser, I use Quill, which only has a posting interface. On my phone, I use the Micro.blog app, which does have a feed, but is much less of a time-waster than Twitter for me, thanks to its non-manipulative UI.
I've removed the Twitter app from my phone, but I can still post from my phone if I want to, without the constant temptation to check my feed.