Very streamlined is putting it mildly. Besides, does KH having rail shooter sections make it a Rail Shooter?
And Katawa Shoujo is one of the better VN's around and it has no Voice Acting whatsoever.
Have you ever played a point and click game? They tend to have puzzles, one path and don't revolve around trying to getting H scenes. KS doesn't have voiceovers because it's a US made game. Sam & Max has more gameplay and characters than KS and doesn't need you banging an armless girl because you feel sorry for her.
Seriously, you" point and click" at items, use your brain, interrogate and figure logic puzzles in Ace Attorney. You don't keep skipping the dialogue until you put on a pearl necklace on a girl with a burned face.
Here let me help you and Xxenace because he hasn't apparently played real point and click games:
Sam & Max Hit the Road
Day of the Tentacle
Monkey Island
Gabriel Knight Adventures
King's Quest
Full Throttle
Grim Fandango
Get acquainted because you have absolutely no idea how very different the genres are.