Things that at 1st glance useless! (XCOM 2)

Passed the game 3 times already and each time to find himself odd new!
Here's an example of seemingly useless contact mine! I was the first 2 times not even once its not used, conductive I think, give me to taste, was a priceless thing! Put it to the Grenadier! (though not necessarily him). see Pak enemy in stealth throw him under the feet of this mine(the trick is that she throws herself at a distance and does not display the mode of disguise!), if the Grenadier perk with artillery fire so all you can throw 2(if Park is of course dangerous or 2-3 pack). All Overwash and voila Pak is. So today I ran into a 3 pack (8 opponents, STRAND Mackey, archons and a few soldiers! 2 mines and all dead).
I do not like the branch Grenadier on guns. Now to inject this one to test! I don't know why, but my pulemetske experienced the wild hostility to any sectopods, gatekeepers and other thick scum! with improvement in gun accuracy and chance of instant killing with dual shot he wanstall almost every 3rd! and so this is actually a very effective fighter at medium distances! massive damage to one target, explosives, makes it very, very effective! Double shot, sectopod generally no armor, + label that gives the whole squad a chance of hitting! in General, comrades, I really liked it) 2 Grenadier - one heavy, the second bomber.
Share interesting things, interesting possibilities of certain classo, items, skills.

PS Just found out that cranial drill with the improvement increases the skill of hacking, which is very, very useful to specialists.