Not going to directly reply to the reading comprehension impaired, but my point is that part of the philosophy was required.
To print technical papers to a phototypesetter, one of the first use cases for which the UNIX project got serious funding, required a pipeline so that, as I remember, tables, equations and basic formatting were all separate programs piping their output to the next, with troff at the end (as I recall, I only used nroff in one step to a Xerox daisy wheel printer for one paper before I moved to Scribe and then TeX to a laser printer). No one single program doing all that could fit into the 11/45's split I&D address space as described above.
Now we can and have made individual programs bigger, but the philosophies of doing a limited number of things well and communicating by plain text are still very solid for many applications (but, not, say, many of the use cases of Photoshop/GIMP etc. Or a browser. Or (in)famously, the linux kernel itself).
How much they should apply to system initialization and daemon management etc. I just don't know, haven't examined the issue. Not entirely, I would hazard a guess, certainly nothing I can think of that looks like the chain ending in troff. That the creators of systemd are reported to have ignored this philosophy does not automatically make it bad.
Their reported consistent bad behavior (from people I know and trust, at least in the case of Ted Ts'o) would seem to make it automatically problematical. That Linus felt compelled to revoke this person's kernel commit privileges (https://news.ycombinator.com/item?id=7522791) is also telling.
Or let's put it this way: a program like systemd must, by definition, "play well with others", that's its job after all. That main developers can't do that in the real world is a very bad sign.
But before that a lot of universities paid $800 (call it $3,000 in today's dollars) for a tape and site-wide license, and ran it on relatively cheap PDP-11s. And I've heard one or more of the team, perhaps before that, would travel with an RK05 disk cartridge seeding copies.
Tapes shipped "from Ken, with love" are part of the legend.
Another significant factor was the 1950s consent decree under which AT&T operated, which prevented it from going into the computing business, as well as the lack of an explicit recognition of copyright for software. Effectively, AT&T couldn't sell Unix, even if it wanted to, so it had to give it away (or charge no more than the media fee for it).
This all changed after 1984 and the break-up of Ma Bell, giving rise to the UNIX Wars, Free BSD (1-800-ITS-UNIX!!), Minix, and a longing for the days when small furry creatures from Alpha Centauri were real small furry creatures from Alpha Centauri.