We need Object Model Diagrams (OMDs) for developing in Pro. Before you scoff, please read the following:
When ArcMap came out we found the OMDs essential. ArcObjects was something completely different from Avenue and during the process of converting programs from Avenue to ArcObjects the OMDs were an invaluable reference. Yes, they were difficult to navigate at first, but once figured out they allowed one to view objects and their properties, methods, events, and inheritances at a glance. We printed them out on E-size sheets and kept them handy for a few years. As familiarity with ArcObjects grew and the number of examples on the web increased, the need for them receded.
The switch from ArcObjects to Pro .Net SDK is similar. The new model is in many ways quite different from the old one. Yes, the online documentation has hyperlinks but those are not a substitute for information-rich, consolidated diagrams that present the information in an easily digestible form. And lets be honest, the on-line documentation still leaves a lot to be desired.
I spend most of my days developing in the ArcObjects world and on those less frequent occasions when I get to work in Pro it is maddeningly difficult to understand the object relationships when there is no clear example from which to work. The community samples are often helpful, but when your issue is not directly referenced and you just can't figure out how "a" relates to "b" they are not as helpful as having the OMDs.
To be honest, I don't have much expectation that ESRI will create new OMDs. But a person can hope. Thanks for taking the time to read this.
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