Greetings,
Mr. H. "...everyone is on the same page." Problem is there are usually several equally acceptable approaches to the same problem. I agree, butyl tape does have it's uses but is it the "best" in any particular application? Personal decision. Same goes for deck seaming materials, caulk, waxes, filling compounds etc.
For example: I've had bad experiences with Life Caulk and as a result will opt to use another product. I've had good experience with 3M 4000 in certain applications and will continue to use it.