I do agree that Chiru is rather ambitious, and it’s what tripped people up when they didn’t adjust its new set of rules.
Though that was honestly predictable seeing how Ryukishi sets things up in the Question arcs. EP1 is the first people will see, and set their genre expectations accordingly. Not everyone will appreciate a sudden shift/blend into something different from what they expected to get midway through the story.
(It’s kind of tragic. I think Ryukishi tried several times to fix that expectation but nobody listened to him at that point because “burn the witch”. But whether this is Ryukishi’s fault for setting wrong expectations or the readers’ fault for sticking to wrong expectations is not something I want to go into right now.)
Hmmm… It didn’t really seem to me like Ryukishi was criticising the mystery genre itself though.
There is one scene in EP7 that seem to suggest mystery doesn’t care about the ‘why’, but I think Ryukishi meant to just call out a certain attitude towards the genre here.
If he actually claimed that about the genre, I’d have to wonder if he actually read Christie.
(However, it’s worth mentioning that even back then, “perfect logic puzzle” vs. “realistic/good characters” was a point of contention and authors could pretty much be placed on all sorts of points on that spectrum, so maybe he’s alluding to that. Wouldn’t exactly be anything completely new.)
So yeah, I think it’s more about not having “the Erika attitude”.
Case in point:
Dlanor, the closest we get to a direct representation of orthodox mysteries, may be allied with Erika but is clearly much more of a fair person, to the point of actively helping Battler’s thinking back on track.
Battler also gets completely demolished in EP5 until he has that talk with Dlanor and changes his attitude/approach.
He then proceeds to fully understand everything, including ‘the heart’, using those mystery rules as a guideline.
EP6 is basically one giant hint if you actually bother trying to make sense of the love duel instead of just dismissing it as meaningless.
(which Erika actually doesn’t even pay attention anymore by the end. She pays the price for it. I enjoy to liken this to her ‘skipping pages’ because hey, she’s already found a plothole! She won! The author is exposed as worthless! Why keep reading?)
There’s also that infamous goat battle in EP8 where Dlanor and Will seem to be having the time of their life.
They shrug off some criticism about how they’re outdated.
The only thing that enrages Will is when one of them doesn’t even try and calls the whole thing pointless.
What I’m taking from this is less of a “These other mysteries are no good” and more of a “No matter how weird, unusual, or frustrating the mystery may get, give the author a chance and at least try to understand.”