Basically, all artists grow and evolve over time...every artist does it, some just more extreme than others.
Maybe Tech feels like making "party" music right now because that's the mood he is in. It seems to me that how Tech is: he makes music from his soul and right now, his soul is livin the life. And people want to fault him for that? How fuckin selfish can you possibly be?
Its been said numerous times BY Tech himself that when he made Anghellic, he was in a difficult place emotionally, thus spawning that album. Unless he goes through another depressive mode in his life, you can forget ever trying to capture that magic again.
And to think, people wanted SOOOOO bad for Tech to get "his dues" and now that he is finally heading in that direction, people are all pissy about it.