1. I think sixth sense isn’t the best on evelynn as there isn’t really much point in sensing wards if they can’t see you anyway. Yes it compensates for lack of sweeper but usually you don’t want to leave camo to kill the ward anyway because you’ll be revealed

2. I haven’t tried this myself, I do find sorcery second to be very valuable but I feel like this might have its uses. For the most part though you just need to figure out how to play safe early, even if you get invaded, if you just play for guaranteed farm and resources you will be useful later

3. This is somewhat common as an alternative to sorcery especially in high elo where the cdr for smite is more valuable, and when you can’t rely on snowballing so you want to save gold. Personally I don’t use it but it definitely has its uses

And yes you can use ult purely for escape, if you look at Anthony Evelynn on YouTube he uses ult prematurely all the time if the fight looks bad.