Would love the ability to adjust V2 elements or any items for that matter based on breakpoints like some of the other builders.
i.e. click the phone icon and adjust the padding specific to phones, set the text left aligned on desktop and center aligned for mobile etc.
For me responsive design is a real weakness in X / Pro and it requires loads of additional time and custom css to achieve good responsive layouts for simple things like padding, margins, font sizes, alignments etc.
Recently used another builder on an existing project I had to take over. This builder had this feature and it speeds up development 10 fold. Moving back into a project with Pro I am now finding not have this feature an absolute pain.
