Yea craftz in towering guilds where people are kicked regularly for space there isnt really a need for the mute button.

But I can think of a situation when this option is useful to you.

Say i am leading a towering guild and two of my core members decided to have a drama in the guildchat over a girl or something and affecting everyone. Say I didnt want to kick them because they are my friends and or because they have contributed enough and or because I believe I shouldnt really kick anyone for personal fights. The good way is to ask them to bring their fight to PM and if they still wouldnt do it, the mute button would be useful. Blocking them wouldnt do any good because everyone else in the guild will still be seeing their GC and responding to it.

This has happened to me before, my current solution to problems like this is a 'temporary kick' and rec them back when they cool down. but i still think a mute button will serve better. Its tedious trying to find them again and rec again after the 'temporary kick'.

Also im pretty sure there are many over zeolous 'indian chiefs' in towering guilds who are making orders even though they arent leaders. They are just enthusiastic and 'overhelpful'. If you want to kick them you could but Mute buttons can put them in their place and give them the chance to correct themselves without additional drama and grief.