What's a gameplay scenario you've given up on making it work?
For me, it's mazes that are not abstracted through rolls or other mechanics. Dealing with a strict, grid-set labyrinth is too much mental work if playing with theater of the mind, and if the players are permitted to draw the maze then it takes a million years even if you hold their hand with the map-making. Of course, IT CAN WORK, and I know that some people can enjoy taking their time with a challenge like that, but I wanna do more things in my sessions, lol.