Yeah, but increasing the damage and removing backstabbing at all would make less scoundrel like and just a different kind of warrior. Also probably would make daggers quite obsolete?
Daggers wouldn't be obsolete, they are still the only 1H Finesse weapon and are required for many Scoundrel skills.
I agree that without Backstab it removes some of the feel of the Scoundrel/Rogue archetype, and would be a lazy solution. Making everything the same achieves balance, but is no fun.
Personally, I don't like trying to be behind my targets for Backstabs. I find the forced positioning very inconvenient.
I wish I could avoid the talent entirely when playing a Rogue, but Larian has made rogue damage non-competitive without it, and one is taxed a talent and inconvenient positioning with it. Perhaps I would enjoy it more if it felt rewarding, but it feels like a penalty to just be on-par.
Backstab should at least be included by default for Daggers since they're not strong enough without it (at least in lieu of some other buff E.g., piercing, more crit, more attacks, etc.).
I'd prefer Backstab remain an optional talent, as I don't like the playstyle and I don't feel like it's a necessary part of the identify, but in the current state of the game, having it built-in would be better for balance.
Having a 2nd Finesse weapon with damage equivalent to 1H Str weapons and no Backstabbing would be nice for diversity too (Blackjack anyone?).