Before systemd, a difficult bug was a difficult bug. With systemd, a difficult bug leads to an attack on systemd itself, and questioning whether it should even exist. I like systemd, it's a pity some vocal people aren't enthusiastic about it. Just like politics and the news, when you read of something being attacked, I think "who is saying this, doing they have an underlying bias against this thing they are attacking…
But if you do believe that the identity of a speaker is more important than the arguments they make, note that the author of this blog post has a history of praising systemd (e.g. https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdRight) There is no anti-systemd bias motivating this post.