Heh, then my firewarriors would throw you for a loop as they all have grenades on the model but have never actually had them in game. I just like the way they look . However, you are absolutely right about INFORMING the opponent. So long as you do so, there really shouldn't be a problem, especially in friendly games.Most people will go for a compromise. If someone (preferably someone wihtout access to wargear) in a squad has an 'everybody must take' upgrade like grenades, modeled on the mini then you can assume the whole squad has them.
I assume you mean at a tournament, since you can do whatever you like with your friends. Simply put wysiwyg means that your opponent can tell exactly what your unit has simply by looking at it. i.e. literally, what you see on the model is what it has.how decisive exactly is wysiwyg? i mean, i like to use twin-linked missle launchers with my wraithlord, but you cant just buy a model like that and i dont wanna buy another wl just so i can put on another ml. how exact is wysiwyg?