I personally never mount any field mods that increase stun duration, unless I’m playing light tanks. I don’t need stuns to be any longer, it’d just get more irritating. Even though some upgrades seem attractive, I’ve never tried a single field mod that lengthens stuns.
Now, is this a dumb thing to do? I’ve seen some pros ignore this drawback. Guess it makes sense for clan wars. Also they’re probably confident they will always be in a position where arty can’t punish them – but even then, that bullshit can reach you anywhere… So, what does the majority think?