Is revit really a multi discipline software or an architecture thing?
Why every commands are related to wall?
I'm on MEP, I want to align duct, canalisations, lights, etc.. so what does that means :

Wall axis?
Wall faces?
"Porteur" axis and faces? (have no idea what is this word, i think it poutre/beam)
And no matter you change this option, nothing change when aligning canalisations.
It's not understandable for beginners. It's still for me, lots of things i don't what it means, what the purpose.
And don't search in help files because it's always related to structure or architecture, nothing for other disciplines. It's useless.