Graphical enviroment is ChromeOS which is basically just Chrome and extensions. Yes - HBOGo, Spotify, Inbox, Photos could be used as apps but they are still working in a browser.
And with crouton I have Debian stretch CLI which is just that - Debian - solid, stable and there is solution to most problems.
This setup is amazingly portable. I make regular backups with crouton and keep USB stick with ChromeOS installer on my keychain. Now I am spending summer vacation and I have left my Mac at home. So I have just installed ChromeOS on 10-year old Acer laptop, Google downloaded all documents and extensions in 15 minutes and I have installed crouton and recreated Debian from backup.
In 15 minutes I had been up and running in my home environment. Of course - touchpad on Acer sucks compared to Mac, laptop gets hot and screen estate is 1/4 of Mac's Retina but every single setting in environment is 1:1 with my Macbook.
I have never been heavy user of macOS native apps and I have slowly moved from Apple/iCloud walled garden to Google (Photos, Drive etc.) so jumping ships had been painless for me. My memories of macOS is of never fixed annoying glitches, heavy 'obligatory' updates and tons of unnecessary files cluttering my drive.