Thanks, he sends me a lot. Since I know he isn't trying to get me to like idols and he generally has good taste in images, I let him send stuff.
The previous night he showed me an image of his LL shrine at his workplace. Amazed he gets to work somewhere where all his fellow employees let him have that and treat it with care/don't steal anything. That said, Rin from the newer round of Idolmaster is his true love. I don't even want to think about how much he spent on a doll of her and all the outfits.
In regards to Delta, it's just the overall package. When Macross was a more balanced composition of mechs and idols, it was what I was into, particularly the DYRL movie. Lynn Minmay's songs are pretty iconic and I do listen to them fairly regularly. It just gets weird when now the idols are essentially the whole show and the mechs are almost non-existent. But I guess that's anime in 2016.