It makes sense for me that a cursed item will do "demonic" damage to a living wall and even to a nonliving-Phisical wall (The one from the warlord); i see it like roting or something like that; and it makes sense for me that if you are surrounded by swords of light or are covered by metal edges/spikes they will damage these walls as well. In my limitated knowladeage of the world if you are touching a piece of metal, a thunder will reach you with less problems (And, in my mind, with less lost of power) and the plants dont get so much damage for water like other animals (because they don´t "breathe" in the same way) so for me nothing of these are thematic problems.
In other hand the plant should have get a Lighting-X trait and even a Light -X trait, but this is a small error for me because you can argue many things abouth that ("So much light will Kill the plant" or "Electricity will make internal burns on the plant" or "The plants in MW must have a brain, therefore it will be afected by electricity" etc)....

But the trigger of a damage barrier or not when you are trespassing a wall it´s... simply bizarre. The wall it´s touching you and it´s damaging you. If you are a living Fireball the wall have to be damaged but if you aren´t and you only have a "Defensive sistem that triggers when something is hitting you" it have to be damaged as well.
Untill now the things in Mage Wars have being working just like common sense says it will work. Even in the rulebook it´s written that the things in Mage Wars are designed with this concept in mind. It´s not a big mistake, but to me it "shut my inmersion of" of the game (I´m not sure if it is the correct way to explaining it). For me it is, at least, something weird when you compared it to the rest of the game.