I agree with this pretty heavily, but I also think there's a happy medium to be found.Please no. What the hell? In medias res is a literary technique identified as such from as long ago as the friggin' Romans. Even that it was already understood that tedious info dumping and endless setting up was bad technique as opposed to naturally revealing information as appropriate.
Please don't give bad writing advice. Overexplaining does awful things to storytelling; it's an absolute drag, always feels clunky and artificial, and doesn't give enough space for the author to die (as in, give room for the reader's interpretation and speculation instead of relying solely on the author's intention).
I feel that some sort of bio/index system for characters/places would be interesting to do. Not something that's shoved in your face, but instead a sort of compendium of information you can go look at in-game whenever you want, for the people who are into getting lost in all the little details. Perhaps with a phone icon or something like many games do.
As for lore speed, however, things will come in due time. I don't want to spoil the story or undermine it by shoveling lore out on the back of a truck when no one is ready for it. It's a good thing to have suspense and mystery to things and not everything needs to be explained. Sometimes not knowing is part of the fun of it all.