Here's my gripe with these things. It seems like we're going backwards. Years ago everyone used Frontpage and Dreamweaver to create their pages, which was fine. But it soon became apparent that handwriting your own HTML gave your far greater control and added way more value, and so use of these visual editors died down. But now they're back for revenge, except from the browser this time, and stuck with a totally overused css framework which in my opinion [when used at stock] completely devalues your design.
As a then designer who took the time to learn HTML and CSS during the WYSIWYG cull of the early 00s - which wasn't that hard - I just can't see why these editors are needed.