Light pen at 8-10 diff

So, since pretty much the launch of the game I find myself completely neglecting light armour pen weapons on difficulty 7 and above. There’s just extremely limited usage… why would I pick the tenderizer over the adjudicator when fighting bugs at diff 9? Too many shield and commander bugs to find a good use for it. Too little ammo to just use for small bugs… I look at the light pen guns and support weapons and think, “Pretty cool guns, would be cool if majority of my enemies didn’t have midium armour. Feels like medium pen should be default. That’s just my opinion after 400 hours. What y’all think ?