You have asked "...what other peoples opinoins are..."
It is completely and utterly up to the person doing the roasting as to which way they prefer, and the only way they can know is by trying both ways and forming their own opinion.
This is not a smart alec answer, it is the god honest truth.
Try it both ways and keep in your minds eye that you are in this regard doing a straight comparison between a pre blend and a post blend of the same mix percentages. You might "test" for whatever you like but for example, the test might be simply to see if you think there is a difference or not and if so, what do you think the difference is...
Its not about whether one way is "better" than the other (except if you think so as a result of your trying), but more about "can I pick a difference and if so what is it and is it important to me and if so is it important enough for me to change my style of roasting to suit for my own personal satisfaction (or in the case of a roaster business, for the betterment of the product and the clients).
The idea simply is....See what you think. This type of thing is what differentiates one coffee roaster from another.
Your topic is good. This is a discussion about real coffee appreciation.
Hope this helps.