Same here. The classic VNs where you just read'n'click to advance with the occasional illusion of choice gets boring after a while unless the story is really good.
With sandbox you get actually
some gameplay and the feeling of having earned it when you finally get to the next base with the girl, while with VNs you're just along for the ride.
So yes, a well made sandbox is something I love, but there are oh-so-many ways for devs to shoot themselves into the knee and make the whole thing unplayable,
- Horrendous navigation. When a simple house turns into a confusing labyrinth of arrows scattered around.
- No indication of where what who or when something is. Often paired with slow and horrendous navigation and moving between zones costs time, so everything becomes a tedious exercise in clicking and reloading.
- Non-obvious progression through repeat-events. Why would I waste time to repeat that event if I think it does nothing?
- Money/Stat grind that isn't also some kind of story progress. I get that money and stats are an important tool to pace progress and forcing players to prioritize... but if all that means that the player spends a few ingame-weeks with a work-gym-study-sleep cycle and then get everything right away anyways? That's just a dumb timesink without story purpose.
- A VN that's simply masked as "sandbox". You have a map. You have locations you can visit. But you still need to follow a set path of steps. In that case the sandbox just wastes time and adds clicks, but the story is indistinguishable from a VN. Just make it a VN!
- ...and probably many more potential traps that I forgot.