way too many macOS icons are set on a rounded white rectangle which definitely reduces your ability to quickly identify an app. miss the old days of unique app icon silhouettes because it definitely helps with quickly identifying the app.
Years ago I needed to run from time to time a very old version of XCode (2.X while the current one was 3.X). I opened the original icon of the old app in Gimp, turned the blueprint to a red hue, and replaced it. Easy to tell what you have open in the dock!
https://github.com/dhanishgajjar/vscode-icons