Use case 1:

I have DMN Knowledge Model (function) connected to Decision Node. I am trying to invoke that function in Decision Node. I double click Enter Function. But no context help is offered. it's just a dumb text input field. I need to manually type the function name defined in my DMN Knowledge Model node. 

Use case 2:

There is context help for Data Types, but not for Data Attributes:

Data Types - help is present.

Data Attributes - no help is present ('amount' is defined in Application)

Use Case 3:
 
Some fields are completely missing contextual help: