With Android 8.0, Google is implementing something called Adaptive Icons, which allow the end-user to decide the uniform shape they want all of their installed app icons to look like. Unfortunately, with this change, apps that have uniquely-designed icons like the old Slack app and Adsense will have to be changed to work with the new system.
Do you prefer the new round and uniform or old unique and personalized application icons?
I guess that's a minor change that won't affect many of users - only true design freaks
Honestly, I don't pay attention to the shape of my icons - I find more important the colors and the logotype that it shows, it has to be distinguished from other icons so I would not have problems with finding my app on screen.
We don’t prefer any specific preference for icon shape. Anything will work for us. It’s other things like the user interface, logo, and features that really matter.
Also, this is a minor move and will not affect many users except people who’re truly into designing.