At least there is an option if you want to. Compare to that to the Android's biggest rival, where different browsers are glorified skins on top of Webkit.

My parents are also the least likely to install a browser other than what comes default

Never explain low level details to parents. Just tell them what to do. In this case, it's as easy as sending them a link like https://play.google.com/store/apps/details?id=com.microsoft....