To me Tech went from having dope albums, to just having dope songs on weak albums, to having dope verses buried in weak songs on weak albums. I think it got to the point where it isn't worth the effort, unless it's placed in front of me I'm most likely not gonna hear it.
But that being said Tech is one of the most skilled rappers ever. Wordplay, lyrics, flow, he's a genius. He just buries himself with a supporting cast. You take an "A" rapper, surround him with "D-" rappers on a bunch of "C-" beats, you end up with a "C average" album where it's too much work to find Tech's decent verses in.