1080 and 1080ti have problems with like half the algos for Nvidia, which is why most people don't buy them.
I wouldn't say so, neoscrypt mining is the only problem I got, every other algos doing just fine with 1.7x-1.9x of 1070s hashrate.
NO! don't do that, please! :-D
(don't start that kind of discussion with bensam)