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Build AI agent from scratch vs use a platform, I've done both, here's the honest tradeoff

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Built three enterprise AI deployments from scratch with LangGraph. Then shipped two more on a platform. The honest comparison.

From scratch:

- Full control, custom architecture, no platform lock-in

- 4 to 6 months to first production deployment

- Compliance, governance, audit trails all custom-built

- Team needed 2 to 3 senior AI engineers minimum

On a platform:

- Faster to first production, often 2 to 4 weeks for standard use cases

- Less architectural flexibility, but most teams don't need it

- Compliance and governance shipped, not built

- Team can ship with one strong engineer and platform support

The honest answer, build when AI is your moat, buy when AI is your enabler. Most teams I've talked to confuse the two. What is your opinion about this?

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As a solo founder I had to go platform — built PublishAI on Groq API + Vercel in weeks instead of months. For solo devs or small teams, platforms are the only realistic path to shipping fast. Your point about 'build when AI is your moat' is the key insight. For me the moat is the niche (authors/publishers), not the AI itself — so buying the AI layer made total sense.