Screaming and crying that vertex groups for shape keys dont work with the mirror modifier. Why. You can have assymetrical vertex groups but not shape keys???? Why not???
Cannot stress enough the evil that is the symmetrise option in blender. It does not only symmetrise your mesh, it symmetrises the vertex groups too. So it will break all of them. Which on the average model is hundreds of them. Pray to something if you dont notice this because it is a fucking model ruiner. You WILL have to go through them individually and unsymmetrise them all.
'only apply the mirror modifier when youre done with the mesh' who the. who the fuck know when theyre done making a model???
Like yeah its technically fine as long as you have good model hygiene and lock groups youre done (Edit: it symmetrises them anyway!! Even if you have locked them to be uneditable!!! aaaaaaAAA) with but man. I just. I dont want. to. If the limbs clip thats between me and blender I cant fix it without applying it and so its just gonna have to be wonky forever.











