I think this is probably why this kind of mod remains enabled. Despite it affecting other’s experience of the game, it doesn’t “directly” affect unmodded players’ experience. It does so indirectly.
From what I know about scripting frameworks, i don’t think it’d be too hard to fix simply by disabling or reworking functions that can be used to highlight things through walls.
The thing is, I think Fatshark should probably consider how certain mods indirectly can disrupt others’ experience of the game, and change how the game is played. Being able to see through gas, or making parts of talents like the Veteran enemy highlighting should come pretty close to the critera.
For example, by giving you highlighted enemies through walls, you could say they’re devaluing the investment of upgrading your skill tree, and
“outright cheating” could be something like seeing through walls IMO or for intended modifiers like lights out. If I see someone sniping through gas, it’s gonna be kinda obvious and suspicious.