Why did chaining ships fail at Sluys?

Why was chaining the French ships such a bad idea?

The formation could not remain orderly in a tidal estuary, so environmental forces tangled the ships and surrendered all freedom of maneuver.

The French concept made superficial sense: close the estuary with a wall of ships and force the English to break against it. It failed because the anchorage combined river flow with strong tidal movement, changing wind, and waves. Chained formations sometimes worked in the Mediterranean, but North Sea and North Atlantic conditions made the loss of maneuver disastrous. The mistake was especially costly because it neutralized a larger, more experienced force holding what should have been a strong position.