If you mean Glass then you are a bit mistaken and don't know as much as the scope of things yet. 1 Let me tell you we're just about to finish adapting the material pertaining to LN 10, there's currently 22 out and no end in sight yet, (I honestly hope the author doesn't rush it just because no volume since around 2020 and news of a new one are incoming DX). 2 The other heroes like Ren, Itsuki and Motoyasu haven't joined Naofumi yet, nor have the other main ones on the other world besides Kizuna and they act similar than the other 3 stooges thinking it's a game. 3 Each of the main cardinal wep has 3 power up methods and the 8 vassal ones have 1 power up method, so MC and all other heroes need to implement all methods to be strong enough. And 4 we haven't finished learning about the lore of the waves (and YES, this includes the LNs where we know a bit more). Tsukimichi is around 90-100 chps and the web novel has around 400 or so chapters or more assuming it continues still being written, LN might have compiled it more but no where has it been translated to English. And SAO has like 22+ volumes too...and 5-6 Seasons and 3 movies...these series take a long time.