I dislike the way Nintex forms doesn't allow you to control the sequence for how form data is loaded. This affect load times tremendously, including sql controls. We want more capability with the form, please look at Spark Forms they have good methods and a real competitor.
Also I dislike how Nintex doesn't allow you to control the confirmation box after form submission, it seems universal all the way around. Also how nintex forms splits mobile and list views, it should just be responsive.
Also we should be able to surface sql data as a pop up or interact with it differently across the form.
We should also beable to control what we want printed on a form, so we can setup print views.
The boxes for page breaks are also annoying, and users can identify where the page splits, I think you should define the page size you want it print it on maybe prior too and the form automatically creates page breaks for the developer.
Sometimes control panels leave gaps that is just hard to manage, and also the spacing is so tricky. I wish we could also attach photos outside of mobile mode, so we can do inspections much easier and make comments and mark up the photos. Some people use Surface tablets not everybody uses phones.
We need pagination for case management type work.