The EE doesn't change anything about who has stuff ignored by PW, so nothing would be ignored.

PS does make the damage penetrating, so it would be penetrating for the attacker, too.

After you've been playing for a while, it can be hard to remember what your first game was like (and even harder if you didn't have a good group of people that helped you learn). I initially learned how to play this game on my own before I knew about HCRealms and reading through 20-ish pages (at the time) can be quite daunting and there's a lot that your brain just can't retain when reading all of that. The players that have a supportive group teaching them may have never faced that struggle, but there is a LOT in the rulebook that can be missed even when you read it cover to cover the first time or two.