That is absolutely true for as far as it goes. I come from a bluegrass background. I am used to listening to everyone else, and having all the musicians play with and off of each other. To play that way, you have to not only be able to hear the other musicians but you have to actively listen to them. I've used IEM's in various settings for a long time, and with the right people, they are a legitimate way to do the job. I think they are really great for stadium shows where you have multiple amps and maybe more than one 4x12 cabinet going full tilt on stage. They can work ok in a small venue also, but they are not ideal and are not nearly as good as being able to hear your band mates acoustically in a small setting. Most churches have this backwards, at least in my opinion. I've played in both these types of settings, and I'd much rather have the IEM's on a really loud stage vs. a church stage. Again, that is my personal preference.