That viral free AI stack tweet is 90% right — here is the 10% nobody talks about

So dropped a tweet listing the full /usr/bin/bash AI stack for 2026 and it blew up - 68K views, 1.4K likes. If you haven't seen it, the gist is: you can build a production AI system without spending a dollar. Ollama for LLMs, LangGraph for orchestration, LlamaIndex + Chroma for RAG, MCP for tool use, Claude Code for coding, Next.js on Vercel free tier, SQLite for data, Langfuse for observability, Docker for deploy. Honestly? Most of this is solid. I've used nearly every tool on that list at some point.