Responses
Because he already received several hidden events / quests which were meant to be discovered much later in the game and he isn't really interested in solving any of them, instead still reading in the library triggering more unique events.
Since all this quests / events are only available once in the whole game, he is blocking a lot of high end content without being aware.
One question, why are the developer dudes so afraid/surprised that MC is getting this hidden quest? Like I understand how it was unexpected, but why does it feel like they don't want him to get it? Was there something bad about it that I missed, or was it just too op of a job?