Some classic games - namely Arcanum, Fallout 1 & 2, and Jagged Edge - are simply too outdated & surpassed for anyone playing now to be able to get into easily.
What's inaccessible about Fallout, other than the inventory (thanks FeelTheRads for telling me about the mod btw)? I'm asking out of legit interest because a lot of people say Fallout is inaccessible and outdated, but it still seems overall well designed and accessible to me - especially when compared with some of the staggeringly bad cRPG interfaces from just a few years prior. Unless you mean gameplay elements beyond the UI, in which case I might agree, but again, Fallout doesn't feel notably different from a lot of 2010s turnbased games to me. "Fallout is inaccessible" is such a popular opinion that I can't tell anymore if I actually disagree with it or if I'm just so familiar with Fallout that I'm missing really obvious hurdles that a new player would face.
Strangely though, I'm going to agree with you on Arcanum and JA2. It's been too long for me to have any specific or useful criticisms, but I remember both of those games feeling like I was fighting against the game itself in a way that Fallout never did.