The problem isn't that sneak level 5 is powerful.
It's that it's more powerful than anything else in the game, by far.
Imagine if getting level 5 telekinesis allowed you to fly above the battlefield, making enemies completely unable to attack you. That would be broken OP, right? That's basically what Sneak 5 is like.
Or imagine if Bartering 5 made all the vendors give you anything you want for free. That would negatively impact the game, because now there's no sense of value to any of the loot. That's what Sneak 5 does to combat.
You do realize that you can arguably do more damage with telekinesis per action point than almost anything else in the game?
Not even making that up. You can straight murder people via telekinesis in combat.
