They make it easier to fit in many errors in a small widget
and provide the user the option to see the rest of the error right there.
Then you have the option in the context menu to go to the actual error text.
I expect these things to be basically available in my IDE
The problem is ides inlining only part of the error and generally skip all the helpful text on how to fix the error.
Expansion dropdowns are nice.
They make it easier to fit in many errors in a small widget
and provide the user the option to see the rest of the error right there.
Then you have the option in the context menu to go to the actual error text.
I expect these things to be basically available in my IDE