As far as I can tell, there are exactly 3 use cases that have demonstrably worked with AI, in the sense that their stakeholders (not the AI companies, the users) swear it works.

1. training a RAG on support questions for chat or documentation, w/good material

2. people doing GTM work in marketing, for things like email automation

3. people using a combination of expensive tools - Claude + Cursor + something else (maybe n8n, maybe a custom coding service) - to make greenfield apps

A $200/month Cursor plan spent on Opus 4.5 calls is not expensive compared to the silly amount of work it will do if you make proper use of plan/agent/debug cycles.