Yeah, I mean I agree with basically everything you say here. With more time to think about it, I guess what I want to see more is just variation and variety for particular players. Don't go slow every time, don't go fast every time. Have a few moves that you know you have mastered at your disposal that all come from different angles, speeds, etc. Basically to always keep the goalies guessing.
I was basing my opinion a little too much on personal experience, I was always one of the best at penalty shots/shootouts/breakaways at every level, Snowblind would've loved me as his goalie if we were teammates. I just know from personal experience the breakaway shots I always had the most trouble with was a player catching me a second late reacting to a quick shot either 5-hole or just off the post stick side as I'm moving back. Maybe I'm also thinking a little too much as in game breakaways vs penalty shots. Basically timing it perfectly so it's a split second before I'm expecting it and as I'm moving backwards. I always had tops reflexes and am a bit of a gumby so I always made/make (though at 28 my flexibility is waning) crazy desperation saves and such.