Can somebody give adequate answer, why systemd is so bad?

See https://trisquel.info/forum/about-systemd

Looking back at that thread, I'm just happy friendships weren't destroyed. I wasn't helping matters, either.

Let's not go back down that rabbit hole, please.

Rather polemic subject ain't it?

https://without-systemd.org/wiki/index.php/Arguments_against_systemd, ‘‘Without systemd’’ has arguments against systemd, that’s just why Parabola isolates nonsystemd and systemd base systems to avoid flame wars between the opposed attitudes about systemd.
Unsure about the ‘‘second kernel’’ argument against systemd but sure for too much deps and requirements creep.
Another issue is, only systemd doesn’t follow service directories like /etc/init.d but instead you always need to run ‘‘systemctl .service ’’ to modify services.