Upfront is a really good front-end editor. But there are some features it lacks. Divi is the best front-end editor. It involves real-time drag and drop. The elements present in Upfront are great, although you could add some more.I would highly suggest you make Upfront somewhat like Divi. You know what, make it better. Elegant themes don't deserve to be at the top of WordPress drag and drop. WPMU DEV does. Please do something about this.
I don't like Upfront's sluggish-looking sidebar. I love the intuitiveness of Divi. Combine them both and you've got yourself the best drag and drop plugin on the planet!
I would suggest getting rid of that sidebar and making the interface more Intuitive
I have full faith in WPMU DEV.
All the best,