Low mobility ADCs (such as Jhin, Jinx, and Ashe) are my favorite because I enjoy the double-edged sword factor. You do massive damage and maybe even provide a little CC while still being relatively safe in the backline, but on the flip side if you get caught out position you die super quick.
So, so true.
I'm looking forward to that niche. I have Varus against juggernaut comps but the closest anti-assassin adc I have is Tristana, but I hate playing her. Xayah looks like a good pick in that situation, also seems fun as hell.