Changing app icons in macOS keeps getting harder, especially since Big Sur where a lot of the best icon management apps no longer work, and the newer apps all seem a bit flakey and unreliable. Other methods I've tried, such as finding and replacing .icns files inside an app, also cause issues.
I know you can no longer change system app icons easily, but changing App Store and other third party app icons can still be achieved most reliably and consistently with the good old fashioned process of doing "get info" on an app and dragging a .icns file onto the existing icon in that window.
There must be a way of doing this same thing from the terminal? Is anyone able to suggest a way of achieving this? It's a pain keeping custom icons every time apps update themselves. Thanks