That's Apple's move.
Latest version is 10.10.1. they seem rather reluctant to go to 11.
That's right, Linux is monolithic, but on the other hand--and this is a crucial difference--Linus is hugely concerned about preventing breakage. Of all the large packages I use, the kernel is the one that gives me the least worry when it comes to upgrade time.
L. Poettering, on the other hand, seems to relish in breaking things. He sure isn't big on commiserating with people whose systems his code has broken.
OK, well then let's do what Linus says is best. What's that? He has “[no] particularly strong opinions on systemd itself”? Systemd it is then!
An authority is a person who can tell you more about something than you really care to know.