Interesting to see if other services follow
When I first got and Android phone, signing it up for Google Play also signed me up for cross-sell services like GMail, Drive and, yes, Google+. I do use Drive, but not the rest.
I don't use social media much to start with, and what I use it for, Facebook is sufficient and also where everyone I want to interact with in that way is found. Google+ thus served no purpose, and I considered it more unwanted "attack surface" for my online presence than anything, though I don't mean to suggest I was deeply paranoid about it.
Thus it was that I was pleased to learn how to disable my public Google+ profile. If anyone didn't know that was possible, ironically the best way to find the instructions is probably to Google "delete Google+ profile". You do want to read the instructions - some Google products are intimately linked and deleting your profile can delete other data, too, but most of the mainstream services like GMail and Drive are unaffected.
So I do wonder if they'll unlink automatically creating a Google+ account from any other of their offerings, since it's clearly not deeply integrated.