Is there a way to open separate instance of chrome where CMD Q doesn't close all chrome windows? I'm using MacOS 10.13.6 (High Seirra)
I was reading through some ways to launch new windows of Chrome on macOS and keep running into the same problem; How can I launch multiple instances of Chrome where CMD+Q doesn't close all of them?  

Perhaps my understanding of what this action does is incorrect? 
I have been under the impression that when I use CMD+Tab each icon displayed is an instance of that application. 


I tried this:

open -na /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome

which seems to open a new window, but I still only see one instance of Google Chrome running in the Activity Monitor.



I found an answer from 2012 that suggests the only way possible is to literally copy the application which I can't believe is still true today. Especially since I want to be able to several instances at a time.
Ultimately I want to be able to work in one chrome environment while
  utilizing another independently. So site data, cookies, passwords
  aren't shared and if I close one the other is still going


Chrome has this feature built in; it's called People or Profiles

With profiles, you can keep all your Chrome info separate, like bookmarks, history, passwords, and other settings.

It's called "Profiles"


  Profiles are ideal for:
  
  
  Sharing a computer with multiple people.
  Keeping your different accounts, like work and personal, separate.
  


The detailed step by steps are included in the link, but to summarize:


Go to Manage People
Add a new Person/Profile
Select that profile