I like this project way better than Bootstrap Studio or any of the others I've tried.
Some suggestions:
1. As others have mentioned, HTML editing is pretty important. I'd like to see my actual content when picking a layout.
2. Would also like to see a theme picker, so I can cycle through combinations of colors/fonts/etc. and see what looks best. I know I can do that under Change Styles, but I haven't the artistic skills to pick individual values and have them look good.
3. Add a search box component.
4. I don't see a way to add a sidebar menu on the left and have a custom content area on the right. It would be nice to have some way to nest components. This is important because I would probably use this mostly for building admin interfaces and dashboards.
5. Someday, in the future, and maybe this is well beyond scope, I'd like to have Vue components so I could just hook them all together and they just work. I expect that that would be a massive undertaking, though.
#1 & #2 are pretty important. The rest -- I don't think they're critical to having a commercially successful project.