for example if you choose to find klaus, it locks out iroha path (at least it's what it seems), for players who picked this option it would be interesting to be able to get iroha in some other way in the future, like say if the option to not find klaus unlocks iroha romance path, maybe the other route unlocks blackmail or seduction paths for her
or maybe after you find the headmaster in the underworld it tags him in the underworld map and if you want to get into iroha path you have to go back and use necromancy on him to get him back
i definitely agree and some scenes should be locked behind paths i get that much but we should have at least scenes with that character unless we pick to not go for them, everytime i play the game i try to do things differently but when i get new scenes or unlock a different path i dont know what choice actually mattered to get me there, very confusing sometimes