I'm so happy that I found this site as I know NOTHING about proper tiling procedures but would like to learn more.
However, I do have to stick up for my trade in regards to taping and Denseshield. In the past, we would not touch it, it doesn't look good when mudded and wears out the flusher heads. Recently, the drywall contractor that we sub to told us to tape the top angle since "the tile doesn't go all the way up sometimes". So we just do what we're told.
Maybe the government should put some money into properly training trades, especially ones where you don't need a ticket - like drywalling- so that we don't end up with huge problems in the future