Wise_Snail
..... The temporal demon spirit book is a supreme treasure which has a library within it, yes Nei Li this, Nei Li that whatever you give him he won't give you too many techniques, why should he ? In his eyes your Mc would he just another person from the Tiny world and according to him it would only be a matter of time b4 he can beat you up and take the book by force or trickery. Rather than that if you absorb the page yourself and gain access to the library yourself you get all those techniques at that very moment and all of em rather than just one or two.
what happens for LoHP is that when you touch a book tat book is recorded in the library, the mc currently doesn't have the full temporal demon spirit book so it would be useless for him to keep the pages, as for giving it to Nie li, that'll be fine cuz 1) he gets techniques from nie li and 2) the book/page is recorded in his LoHP already, did you not know that? what happens to books he records and adds to his library? they still stay in the real world, he only gets a copy of it in his library