Ask HN: ReAct vs. Planning Pattern

My question might seem stupid, but ReAct pattern seems to always work and actually gives great results in the other hand we have the plan pattern and to be honest i cannot think of how it's exactly used in production system, im not sure if this is correct but how it's technically implemented is you give the LLM context and you tell it, hey give me your plan to how you will solve this thing, so now it will build the plan but won't it also follow the same plan in the ReAct pattern to solve that exact problem? I want learn from people that used the planning pattern in production, how and why you used it? and how do you enforce the LLM the follow the plan exactly?