We might fancy some children playing on the flat grassy top of some tall island in the sea. So long as there was a wall round the cliff’s edge they could fling themselves into every frantic game and make the place the noisiest of nurseries. But the walls were knocked down, leaving the naked peril of the precipice. They did not fall over; but when their friends returned to them they were all huddled in terror in the centre of the island; and their song had ceased
—G. K. Chesterton, Orthodoxy, 153
In other words, doctrinal walls are good if they keep us safe and free.
It can also be wearisome to have the kids bouncing off the walls, but if the spirit is playful, it is good.