I think the only lesson you should take from AL is that DPC is gifted at telling stories in a way that evokes an emotional response from players and that you should expect that skill to continue to play out in BaDIK (where it's already been present).It's ridiculous to say that DrPinkCake (DPC) is "known" for crazy or out-of-left-field endings. His first (and only other) released title was Acting Lessons, which did indeed end on a note that was, for most, probably unexpected and was pretty devastating. However, to assume that DPC's second AVN will end similarly or the same is based on no evidence. DPC is not M. Night Shyamalan. Acting Lessons was a high-drama story. Being a DIK is much less so. This is not to say that there won't be some difficult choices or sad moments to come (episode 4 ended with a difficult choice, after all), but to assume BaD will go down the same path as Acting Lessons undermines the fun. And, as DPC told his supporters on Patreon, all the speculation and assumption about this really ruins the joy he gets from working on this content, as well. Frankly, I trust that DPC is a talented enough storyteller that we can expect variety.
And, I suppose, a demonstration that he's willing to provide storylines that don't have utopian, perfect endings for all the characters at the same time. Most adult VNs don't really do consequences beyond making you choose between love interests.