Why escort carriers should not become fleet carriers

Would a large force of escort carriers eventually be misused in fleet combat simply because they are carriers?

Misuse would be likely, but light fleet carriers are the sounder combat option because escort carriers are built for a different role.

Commanders could be tempted to commit escort carriers to fleet combat once enough of them existed. The battlecruiser analogy in the prompt captures the danger of letting a platform's label obscure its original role. Light fleet carriers are the better choice for combat tasks that require a more capable aviation ship. Escort carriers should remain tied to escort work rather than being treated as inexpensive fleet carriers. The distinction concerns operating demands and survivability, not merely the presence of a flight deck.