Thanks for the suggestion.
I have been doing that.
The challenges:
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it is not a replacement for the site grid where you are able to toggle the preview on and off on command
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If it is set on z-index positive to overlay the design, it is a great distraction as you can’t fluidly edit content thereafter without bypassing the “grid.” If set at the back on the z-index then it doesn’t overlay the design.
These are the main issues.