This is a very interesting thread!
I think you nailed it here!. At first, I didn't understand why you said depressive with DT12, since I like the album a lot and the music doesn't sound depressing at all
I do care much more about the music than the lyrics, so that was my first impression.
However, after thinking about the lyrics and themes a bit more, I see why you put it that way. TEI, for example, talks about not being able to scape the voices of regret and pain inside you, TLG is about someone so self-centered that only cares about himself, BTV about someone desperately asking for help.
Never thought of these themes before
This is mine: