FWIW, I have not seen any advantages to systemd, and I have not heard of any advantages that I would personally find advantageous. And there do seem to be potential problems.
E,g, faster boot times don't impress me at all. I'd be more impressed by longer up times. I find binary logs dubious, and many people have reported problems with them. Etc.
I have not personally had any actual problems with systemd, but it's not clear how I'd resolve them were they to occur.
So I'm both dubious about the advantages and worried about possible disadvantages. Sufficiently so that if a BSD supported the ext4 file system I would have a test installation running. But not yet sufficiently to reformat my file systems.