So it's not a case of "just add that", it means implemeting an entirely new kind of user interface within the debugger inspector, and adding new UI usually means the feature request is complicated and time-consuming, which generally means it has to be really important to be worth prioritising over hundreds of other suggestions.
Ashley
It's really disappointing that the debugger seems to have the lowest priority when it comes to updates. While the editor and runtime receive tons of flashy new features, the debugger has remained virtually unchanged since Construct 2.
There's still zero support for Hierarchies, Timelines, Flowcharts, Tweens! Breakpoints still work maybe 30% of the time.
Yes, it's a back-end tool, and new users might not care about it. However, for experienced developers, dealing with its cumbersome UI and the lack of essential features on a daily basis is incredibly frustrating.
I'm not referring to this particular suggestion, I understand that implementing a tree view is a significant request. However, there are many other ideas that remain unaddressed. Here are the features I miss the most:
github.com/Scirra/Construct-feature-requests/issues/329
github.com/Scirra/Construct-feature-requests/issues/6
github.com/Scirra/Construct-feature-requests/issues/290
github.com/Scirra/Construct-feature-requests/issues/406