Not sure what you're referring to. Do you mean "blending" as in "everyone using the same equipment", or "blending" as in "mixing disparate instruments together"? I listen to a lot of period brass- holed brass, keyed brass, early valved brass, recreations of old brass organisations that used all of the aforementioned. I prefer those recordings because you can hear each individual instrument. The character of the player and the instrument comes right through. I have the same quibble with choirs that try to sound like the Talis Scholars. I can't stand that homogenous blah sound. I can take it for maybe one performance of one piece, but that's quite enough. I like choirs with character, that are ensembles consisting of strong individual performers. I want to be able to hear the individual singers. The people that tend to like the Talis Scholars are people who have never heard a live choir in their lives. I've always wondered what would happen if they were required to perform Ligeti's Requiem?