This has been talked to death. Just search the forums thoroughly.
Every argument on this has been said so far, so I don't know
what you'd get by engaging in yet another discussion of pro vs con
systemd.
In short: There are ideological concerns about it. If you don't understand them,
then please read about them first before having an opinion and/or ridiculing
opponents of systemd. Besides, Debian is a done deal when it comes to
systemd. It's probably more productive to have these discussions
within groups that decided against it (Devuan, Mepis, Gentoo, Dragora...)