I have more than 100 synced contacts, and let's say, I want to delete the half of it. I have to repeat the process one by one. I don't have the time to repeat the process 50 more times. And you know what's more annoying than that? The dev team thinking they actually understand. I've seen lots of similar complaints like this, and no, you don't understand at all. Don't reply saying we can delete all of the synced contacts at once. We only wanted to delete SOME, not ALL. Hope this time you get it!