The Reinforcement learning has a major disadvantage that learning the problem spaces are very few and possible states in an environment are only a few. The presence of hidden layer in Deep Reinforcement learning neglect this disadvantage.
DRL is the most general purpose of all learning techniques so that it can be used in most business applications. It requires less data than other techniques to train its models. Even more notable is the fact that it can be trained via simulation, which eliminates the need for labeled data entirely. Given these advantages, expect to see more business applications that combine DRL and agent-based simulation in the coming year.