This is also a good reminder that anyone can have a modern web browser.
Now that browsers are auto-updating this is a good time for us as developers to weed out all the non-updating browsers. I've not been a big fan of browser exclusion but after waiting so many years for all the garbage versions of IE to die (<= IE 10) I've become a grumpy old man. You can have notices appear when an outdated browser is found and link the user to a better life. e.g. http://browser-update.org/
If someone actually prefers to be left out, that should not hold everyone else back anymore.
How are "developer" features not features for the end user? Don't users interact with web pages?
By that logic you could argue that HTML 2.0 form support is only a developer feature. The fact that it enables the end user to input data doesn't make it a feature for that end user?
"Everything should be made as simple as possible, but not simpler." -- Albert Einstein