/mute all is not a solution
When people post something in these boards and people respond with /mute all you are not helping them you are concealing a growing problem that needs to be addressed with league. If the general best strategy is to mute your companions in a team game so that you can only communicate through pings which lets be serious see maybe 10% intended use and 90% passive aggressive spamming. Then there is something wrong with the community and ignoring it may work for you but it won't work for everyone or in the long run. If you have a disease go to a doctor treat it don't cover it up with a bandage and hope it goes away. I can't stop you from telling people looking for direction and help /mute all but just know it's not helpful, it's not insightful, it's the laziest solution that does nothing for the problem.