For sure, I underestimated how much work writing all the events would be, and thus the final result is lacking in a lot of areas (especially the last third).
Charisma (and stat rolls in general) are most present during the first half (I think the last one being at the mountaineer) but they are very subtle and not properly communicated, so I don't blame you for not noticing it. Though it's not just stats, you could probably look at every mechanic and say "that could've been elaborated on", which is unfortunate.