I must have missed that insta-kill button you're referring to.
You're failing to read what I wrote. Witcher 2 and 3 are just spam left mouse button for like 80% of all battles. I guess if you go up against a monster that's 10 levels higher than you, then you may need to dodge or use a spell, but the rest is just spam LMB. Witcher 1 was a different thing but I don't think anyone is gonna sing its combat system's praises.
Regardless, my point was that the game definitely holds your hand -- in combat, in exploration, in nearly everything. It's fantasy-medieval GPS system is actually quite impressive... and also decline. I guess it doesn't hold your hand in knowing what the fuck your dialog option actually results in Geralt saying, as the "fuck you" during the prison interrogation in the beginning of W2 clearly shows.