Should I include a "back" button on a responsive website? [duplicate]

This question already has an answer here:

Do you believe there should be a back button on a responsive website or should we rely on the browser's controls?

If you believe there needs to be a button in the design...

  • Would you have it appear all the time or only on small (smartphone) screens?
  • Do you have any examples of websites that do this well?

FYI I'm working on a website which is more a tool than a content website. Users will need to be logged in and they'll probably visit this website several times a week.

I've found this fairly recent post about the topic, and although the answer is interesting, I don't see any studies/articles to support the points that are made.

Edit: there is a similar post about this but it's nearly 7 years old so it's probably not relevant anymore