I disagree, there is no point in a vocalist Shouting so loud that the words get lost, can you tell me what he is saying in every song? I can't tell half the time, that is why I think he should pull back a little, and if you are aggressive all the time, then it becomes boring to me, just like you both think Opeth is to you. I like Akerfeldt he can do everything and he likes variety in his music which has done nothing but help Opeth, besides all that he Tours here regularly and always gets a lot of support which is another reason I like him.
Just saying you can be aggressive and still make your vocals understandable, but when it is 100% screaming/distorted all the time then you lose me anyway I like to understand what a song is saying without reading a lyric sheet.