You still need to caulk the tile into the dilex and then the dilex into the tub. To me, dilex is useless.

Thats what I was wondering. I guess this would be for joints with more movement potential. I just wish there was a way to get around caulk. I *think in a shower, with coved tile, you could, possibly, because getting the joint onto the floor seems to eliminate separation? Our 42 year old bathrooms with tiled cove with tiled floors abutting that have no cracking or separation at all. However those are also like materials. I don't see how to get around it on a tub.

What about the metal pieces they show around their shower floors/linear drains?

Same here, I've never used it. I haven't used their termination/transition strips much either.

Your weird looking caulk locations...the corners I could see. But is there anything on the wall above the little section of funky-looking caulk at the mid-point on the wall? A soap dish for example? Anything that might hold or funnel water down the wall in that area?

I think it has to do with the trajectory of the shower head and where we tend to stand, nothing more interesting that that. Compared to what I have seen (and smelled..mildew) looking at other houses on the market, its nothing. But it bugs me that we hand dry after each use and it still happens eventually. The hand drying takes but a minute, and the shower never needs to be scrubbed, but those two grey areas irk me.