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2. What email clients has the resulting HTML been tested on?
3. There are some problems with the "primary button" block. First there doesn't seem to be any way to change the button's colour. It's blue and there's no way to change that. The block that contains it has a white background which can be changed, but not the background of the button itself. Then there's the text colour -which by default is another poor option, green text on blue background- which you can try to change but when you press "apply changes" it has no effect, and when you click the element again the property goes back to showing green as the colour. The same happens with the "outline button".
4. In a "Text Content" -"paragraph with heading and text"- there are also some colour problems. The properties only show the text colour of the heading but not that of the text paragraph. But then if I do select a colour and apply changes, it only changes the colour of the text paragraph but there seems to be no way to change the text colour for the heading. The same applies to the "basic header", where you can change the colour of the sub-heading but not that of the larger heading text.
5. I can't select some text with the mouse when editing it. If I try, it tries to move the block. I can select a bunch of text if I use the keyboard -e.g. ctrl+shift+arrow- but it's hard to justify that I can't do it with the mouse in a so-called visual environment.
6. A "text content" block contains exactly 1 heading and 2 paragraphs. The second of those paragraphs says "Add more paragraphs as needed..." but there doesn't seem to be any way to do that and add any additional paragraphs to the block. For that matter, there also doesn't seem to be any way to remove a paragraph from the block.