As someone who uses diagram tools a lot I was attracted to real-time board and persuaded my boss to get a team licence based on how quick it was to throw together quick high-level diagrams.
What attracted me to RTB in particular was the quick and robust way of linking objects together. Links were simple and remained intact no matter where the objected was dragged to, something tools like Visio have never managed to got right.
It is therefore very annoying that links have been removed from the product. Yes, technically they are available under shapes but they do not work nearly as well. It is all to easy to create unlinked line by mistake and not realize until you try and move the objects around.
It also makes the process of creating a diagram less fluid because I have to keep manually switching switching my shape from "normal" shape mode and "linking" shape mode.
All in all I think RTB was made worse by this feature release.