I have a hard time with this seeing as how I feel stealth and invisibility already are making "rogue" characters too powerful. On the other hand I certainly understand what you are saying. All around it feels like talents are too few and far between (especially when 2/3 are garbage tier that no one is going to pick up).
I'm hoping that a LOT is changed in the actual game ( Like why the hell is one man army still at level 8?) and that alpha is set up much differently. A lot of builds could potentially be extremely over powered (reflect damage/necromancy builds for starters) when the level cap is raised above 7/8.
I don't really see how the presence of the Back-Stabber Talent makes a difference for that complaint or how removing it would make the thing you're complaining about any worse.
At the moment the talents are not very good so I really don't mind having to put one talent point in backstabbing since there is not much else I want anyway.
The Pawn, Parry Master, Duck Duck Goose, maybe Slingshot, even What a Rush. Possibly Leech and Hothead depending on your build.
I agree that Talents are in drastically need of some love from Larian, but I don't think that "Lots of Talents suck" is a reason to keep Back-Stabber in, but instead a reason to have more Talents which do NOT suck.
If you only increase the damage of daggers, backstabbing would get far to strong?
It is logical, that a knife can't hurt as much as sword, but it is also logical that a sword is worse for backstabbing.
I believe he was suggesting to remove the Back-stabber Talent and then to EITHER add that effect to the weapons OR to increase the dagger damage, not both.