I've always wished for a more (selectable) device accurate emulation (plugin, so the main Dev's are not burdened) in the preview.
Having a
forgiving , WEB render does not help avoid device (EPUBx) limitations without resorting to saving and loading into the Target Device (viewer).
I am
that
improving has become the mantra for incessant tracking. So go for any solution that thwarts the Big Brother mentality of industry.