Early Elixir projects should avoid using Elixir for CPU-heavy tasks. The BEAM VM is optimized for concurrency and fault tolerance, not raw computation, where Python or Go often perform better. Don't over-engineer OTP supervision trees and GenServer hierarchies before the system complexity requires them. Avoid using Elixir if the team lacks functional programming experience, as the learning curve for Elixir idioms, pattern matching, and the actor model can add significant onboarding time for teams from object-oriented backgrounds.
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