What was wrong with the La Galissonnière class?

What was wrong with the La Galissonnière class if the De Grasse-class cruisers were intended as improvements?

Very little: the earlier ships were capable light cruisers, and De Grasse was an evolutionary improvement whose planned armament changed from 6-inch guns before the war to 5-inch guns after it.

A viewer asks what was wrong with the La Galissonnière class if the De Grasse-class cruisers were meant to improve it. After consulting his notes, the answer is that there was not much wrong with the earlier ships: they were decent, fast light cruisers with an aggressive appearance. De Grasse is characterized as an improved development of the design rather than a wholesale remedy. The pre-war design was expected to carry 6-inch guns, while the post-war completion shifted to 5-inch weapons. The exchange shows that a successor class can represent incremental refinement and a changed final armament rather than proof that its predecessor was defective.