I genuinely have no idea what people mean when I read this kind of thing. Are you abusing the word "prompt" to mean "conversation"? Or are you providing a huge prompt that is meant to spawn 10 subagents and write multiple new full-stack features in one go?
For most users, the $20 Pro subscription, when used with Opus, does not hit the 5-hour limit on "a single prompt or two", i.e. 1-2 user messages.