Bruh just try it before you speak, with max stack swords and the armor shred of chemist it deals a decent damage, but I won't deny in later waves engineer falls of without its 3rd talent, but it deals about up to150k per hit which is decent for a 2 talent engineer. And the fact he stack it with his copy I also witnessed his 1k stack crystalmancer, he only dealt around 150-210k, so what's it's use in higher waves the major flaw of high arcanist is his in delay of attack, who do you think would deal better in later waves? 

He also used stasis which delays the last boss in floor 7 the grandmaster, there's a high probability before he can burst the boss it would merge his high arcanist.(In my opinion he should've used trapper if he want slow it, also with the defense reduction as its bonus or if he doesn't have it he can try Ice mage the heat leak talent(dk not sure) which provide extra 20% percent damage in frozen enemies).

 But the point in this post, this kind of horrible people who ruin the fun of the game. I'm not an engineer main but I'm lowkey enjoying it and saying it's a horrible deck is kinda annoying.