Opening suited aces UTG in 6-max question
I'm a live player transitioning to online so I'm trying to readjust my ranges as I'm a rather tight live player who only loosens up to exploit. However, having a look at many recommended ranges from 888poker and Upswing, I keep seeing that they open any suited ace UTG. Intuitively to me this is a losing play as if you open low suited aces UTG you basically have to fold to any 3bet and many times you'll be outkicked against someone who defends their ATo/AJo/A9o etc. How come this is considered GTO optimal play?