Isn’t this more of a way to reduce the energy to support it instead of the opposite? I’m not in favor of removing it, but I understand the reason.

It’s not simply the average person it’s most people that don’t need this. For most people a custom rom adds nothing, most people barely change their wallpaper.

In my opinion, this is not as big of a deal as, since WebKit/Blink is open source. Everybody could just use the same engine and just build their version of the browser around it. Firefox doesn’t need to maintain their own engine.