This is a very difficult subject for me because of how long I made videos for and how much effort I know goes into making a quality video so I can only imagine how difficult it must be for these guys to read a thread like this.
That all being said I think that they should be allowed to use whatever style they want to, that's their right, we don't have to watch and we don't have to follow (I personally like the guys but I don't like the style of video, they asked me so I let them know, I didn't say to change it, just said I didn't like it). If what they are doing is not your cup of tea then don't watch. I do believe there should be a language warning at the beginning of each video so that if there's kids around or you are offended by that sort of thing you can make your decision on watching or not before it's too late.