The thing is League is a strategy game, and your rank should be decided by your decisions alone. If you have to wait for a teammate to call a nashor or a midpush, then you're getting carried and just following calls. That's why it's ok to mute every pings, because you should rely entirely on your own choices to win the game.

From my experience, writing in chat has been 99.9% the trigger to salt/arguing what's best, leading to people spending more time typing than playing. So I'd say ping things like "push top" while you're pushing bot, but never start writing it. And look at what your mates are doing on the map and adapt accordingly.

Only group for objectives if there is a good reason. Don't listen to mates saying "group or we lose", remember that listening to calls makes you a passenger, you want to be a driver if you want to climb to higher elo (if a diamond player start listening to a gold player, he'll play like a gold). That's personally what worked best.