My co-worker has been using OpenRemote and feels that he hit limitations quite often.
I am not opposed to having to design the web page myself and maybe after doing that and learning a lot about bindings and transforms there may be a simpler solution. (Maybe “a lot” should be in all CAPS )
OH has a REST API so you shouldn’t have to worry about bindings for a UI.
I’m probably not the best person to offer to much advice on a UI. I’m off the opinion that any HA that requires you use the sitemap or some other screen interface it is an HA failure. I work extra hard to avoid needing a UI for anything more than debugging.