Well actually Wappler has also a very nice visual designer for Bootstrap 4 - all elements are available and you can add them very naturally with the smart context menu - that shows you only the allowed elements so you don’t do nesting errors and have a choice of only elements you can place in the currently selected context.
Once you get the idea - you will see how productive and clean that is - and will never want to use overfull choice of elements that aren’t valid in the context anyway.
Well not sure how is in Pinegrow, but in many other editors I’ve seen is that you have a whole components panel - that might be sorted and grouped but still have like hundreds of elements in it and you have to drag them out to drop them in design view to find our that you get a wrong nesting or that they are not allowed.
With Wappler you have a limited by design but smart choice - so you get only the elements in the context that you need and are possible.